ESB Networks

ESB Networks operates Ireland's electricity distribution network — the wires that deliver power from the high-voltage transmission system to end users, including data centres. The CRU (Ireland's Commission for Regulation of Utilities) connection queue managed via ESB Networks was a primary constraint on data-centre growth in Dublin until Pure DC launched its 110 MW Dublin microgrid in March-April 2026. Pure DC's microgrid was explicitly designed to bypass the ESB Networks queue entirely, becoming what the company described as Europe's first data-centre microgrid at that scale. The project emerged as the working template for CRU's December 2025 on-site generation requirement.

ESB Networks is a subsidiary of ESB (Electricity Supply Board), Ireland's state electricity company. It manages Ireland's distribution network (medium and low voltage) and is distinct from EirGrid, which manages the high-voltage transmission system. Data-centre operators seeking a new grid connection in Ireland must go through ESB Networks for distribution-level connections, which have faced multi-year queues as DC demand surged to approximately 21 per cent of national electricity consumption.

The CRU's December 2025 rule change — requiring new data centres to have on-site generation rather than relying solely on grid supply — effectively created the regulatory context in which Pure DC's microgrid model became commercially viable. ESB Networks' queues remain the constraint for operators that choose grid-connected rather than microgrid deployment, and the queue dynamics will be central to Ireland's data-centre capacity trajectory.