EirGrid
Ireland's state electricity transmission operator; its adequacy warning puts data centre reconnection on a collision course with grid capacity.
EirGrid, Ireland's state transmission operator, issued a 900 MW fault-ride-through ceiling on data-centre demand loss with SONI on 30 June 2026, live from July, as its own forecasts warn supply may fall short through 2028.
Last refreshed: 4 August 2026 · Appears in 1 active topic
EirGrid warns supply will fall short through 2028; why is the CRU reconnecting data centres?
Timeline for EirGrid
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Data Centres: Boom and BacklashBackground
EirGrid is Ireland's state-owned electricity transmission system operator, founded in 1999 and owned entirely by the Irish state, with a joint mandate covering Northern Ireland alongside its counterpart SONI. It plans and operates the high-voltage National Grid and holds a stake in the UK-Ireland interconnector.
The operator sits at the centre of Ireland's data-centre debate because it publishes the adequacy assessments that determine whether new large loads can safely connect. Its February 2026 All-Island Resource Adequacy Assessment found the country's peak-time margin turning negative for three straight years from 2026, a finding that has become a reference point in political debate over data-centre growth.
EirGrid's REMIT is technical rather than political: it does not decide who may connect, that is the CRU's role, but it sets and enforces the operational conditions, such as fault-ride-through obligations, that determine whether a connection is SAFE for the wider system.
EirGrid caps data-centre demand loss
EirGrid moved from warning to hard rule on 30 June 2026: with SONI, its Northern Irish counterpart, it set a 900 MW ceiling on instantaneous data-centre demand loss, live from July, flagging imbalance risk above 1,150 MW without mitigation.
The ceiling gives EirGrid an operational backstop it lacked before: rather than relying on the CRU's connection conditions or political persuasion, the system operator can now enforce a hard technical limit on how much load can drop out at once, the clearest sign yet that EirGrid is managing data-centre growth through engineering rules rather than policy alone.
Operators route around EirGrid's queue
EirGrid missed its own 31 March 2026 Deadline for setting out, jointly with ESB Networks, how new data centres should engage with and connect to the network. Weeks later, Pure DC's 110 MW Dublin microgrid went live specifically bypassing EirGrid's queue.
For EirGrid, that bypass is a visibility problem as much as a policy one: capacity built behind the meter never enters its planning process, so the operator loses the ability to model the very load growth its own adequacy assessment says the grid may not absorb.