After four years of de facto restriction, Ireland now has a formal route for new data centres to connect to the grid. On 12 December 2025 the Commission for Regulation of Utilities published its decision on a new electricity connection policy for data centres. The policy is not an open door. It sets demanding conditions on generation, renewable sourcing and location. But it replaces case-by-case uncertainty with a published set of rules, which is what investors had been asking for.
The decision comes against a backdrop that the Central Statistics Office has documented in detail. Data centres used 6,969 GWh of metered electricity in 2024, 22 per cent of the national total and up from 5 per cent in 2015. Consumption rose by 10 per cent in 2024 while all other users grew by 3 per cent. No other European country comes close to that share.
The generation requirement
The first pillar continues the approach the CRU took in 2021. New data centres must provide generation or storage capacity, on site or close by, to match the maximum import capacity they request from the grid. That capacity must participate in the wholesale electricity market so it contributes to overall system adequacy. Legal summaries of the decision from Arthur Cox and DLA Piper describe the thresholds: sites below 1 MVA are generally outside the policy, sites from 1 to 10 MVA can meet the requirement with an autoproducer arrangement sized to their demand on a derated basis, and sites above 10 MVA need separately connected and metered dispatchable generation or storage that matches their import capacity.
The logic is that a data centre should not add to the amount of firm capacity the rest of the system must procure. If it brings a matching amount of dispatchable plant, the system operator can call on that plant during tight periods, whether or not the data centre itself is drawing at full load. In practice this will mostly mean gas engines or turbines, with batteries for shorter durations, at least until other firm low-carbon options are available at scale.
The renewable requirement
The second pillar is new. Data centres must meet at least 80 per cent of their annual demand with electricity from additional renewable projects generating in the Republic of Ireland. To ensure additionality, renewable generation that has been or is being supported through state schemes such as REFIT, RESS or ORESS cannot count. DLA Piper's summary notes a six-year glide path to the full requirement.
This addresses the main political objection to data centres in Ireland, that they absorb renewable output that would otherwise decarbonise homes, transport and industry. Under the new policy a data centre cannot simply buy certificates from existing wind farms. It has to cause new projects to be built. That is expensive and slow, given the planning and grid constraints on onshore wind and the long road to offshore wind in Irish waters, but it means that data centre growth adds to Ireland's renewable fleet rather than competing for it.
The location test
The third pillar changes how system operators evaluate applications. EirGrid and ESB Networks must consider whether a requested connection is in a constrained or unconstrained location on the network, looking at the specific application and its location rather than applying a broad regional approach. Under the previous approach, Dublin as a whole was effectively closed to new large connections. The new test allows more granular decisions, and it should let some sites in or near Dublin connect where the local network can take them, while steering others towards regions with spare capacity.
In May 2026 EirGrid published version 3 of its Data Centre Connection Offer Process and Policy, which turns the decision into an application procedure. A data centre can apply and receive a connection offer once it demonstrates access to dispatchable on-site or proximate generation or storage, which EirGrid calls Nominated Generation, and a credible pathway to meeting the renewable requirement, called Nominated Renewables. The nominated generation must either already hold a connection agreement or live offer, have an application in train, or apply through the separate enduring connection process for generators, and the data centre application must reference it. ESB Networks has published a parallel pre-engagement and application process for large energy users on the distribution system, setting out the evidence applicants must provide on generation, planning and renewable compliance. Six months after the decision, the paperwork is in place and the first applications under the new rules are moving.
What it costs a developer
Put together, the conditions add up to a significant increase in the capital required for an Irish data centre. A developer must finance the campus, the matching dispatchable plant, and enough long-term contracts with new renewable projects to cover four-fifths of annual demand, and must secure a connection in a part of the network that can take the load. That will rule out some projects and push others to smaller sizes or to other countries.
It also shifts risk. The dispatchable plant must earn its keep in the wholesale and capacity markets, which exposes the developer to market prices. The renewable contracts carry construction and delivery risk. A data centre that cannot meet its renewable obligation on schedule may face consequences that the policy's detailed rules will define.
Why this is a template
Ireland's approach is the most explicit European example of a principle now spreading in different forms: large new loads should bring their own capacity and their own clean energy. Texas requires large loads to accept curtailment in emergencies. Some US utilities require minimum demand charges and long contracts. Ireland goes further, requiring both firm capacity and additional renewables as a condition of connection.
Whether it works will depend on execution. If the conditions prove unworkable, investment will move elsewhere and the policy will be a moratorium by another name. If developers can meet them, Ireland may show that a small system can host a large digital sector without compromising security of supply or climate targets. For a country where data centres already use more than a fifth of all electricity, there was no option of doing nothing.