Ireland's nuclear opening is a hedge, not a fix

Nuclear fission has been illegal in Ireland for nearly three decades, but that prohibition is now wobbling under a distinctly modern pressure: data center power demand. Taoiseach Micheál Martin told a business dinner that Ireland is "open to" nuclear power, according to the Financial Times, a remark that lands as data centers consumed 23 percent of the country's metered electricity in 2025, almost as much as every household combined.

Data Center Dynamics reports the sector's power consumption has risen 518 percent since 2015, with more than 80 facilities now operating largely around Dublin, a load that has arrived in a country that imports roughly four-fifths of its energy and relied on gas for about 40 percent of electricity generation last year. Ireland's grid is being asked to host an AI buildout on top of an import-dependent thermal system.

For nearly three decades Ireland's nuclear prohibition was a settled question, but over the past year the settlement has cracked. In May, Fianna Fáil TD James O'Connor proposed a bill to lift the ban and allow nuclear power to be officially evaluated, though the bill would not authorize a reactor, only a study. The appetite is not hard to explain — a data center fleet that now rivals the country's households has made baseload generation look attractive again.

Even if the ban falls, the pivot cannot be quick. A nuclear plant takes six to ten years to construct on average, which means a decision tomorrow would not produce electrons before the early 2030s, and Hannah Daly, professor of sustainable energy at University College Cork, told the FT that nuclear is "not something that can address any of those challenges in the next 15 to 20 years." She added that it would face the same, if not more, constraints as offshore wind, plus a new one: uranium imports. The data center fleet that has grown 518 percent since 2015 will not sit idle waiting for a reactor, no matter when it is ordered.

The data center industry has already voted with its contracts, and the US market shows the direction: Google, Amazon, and Meta have all signed deals to take power from large-scale nuclear plants, while the same companies, along with Data4, Oracle, Switch, and Equinix, have backed small modular reactors, seen as the technology that can match data center loads at campus scale. Crusoe has partnered with Aalo Atomics on what could be the first nuclear-powered AI data center at Idaho National Laboratory.

American hyperscalers have already signed those contracts, buying generation the way they buy any other commodity, while Ireland is still trying to get a bill through parliament to study the option. As this publication has argued, power rights have become a distinct asset class, and the scarce resources are consent and construction capacity. Ireland's debate is a national-scale version of that squeeze: the nuclear question is real, but it is a 2035 answer to a 2026 problem.

The data center developers who need capacity this decade will not wait for an Irish reactor. They will buy power wherever the grid can deliver it, likely from the same gas-fired system that supplied 40 percent of generation last year. The May bill from TD James O'Connor is the nearest deadline that matters, but it does nothing for the grid connection queue that is already forming.