Tuesday 18 November 2025

EirGrid, SONI, and SEMO have unveiled a significant update to the electricity grid’s scheduling and dispatch system, paving the way for large-scale battery storage to play a bigger role in balancing power across the island.

The update, known as Initiative 2 of the Scheduling and Dispatch Programme (SDP-02), allows battery units called Energy Storage Power Stations (ESPS) to be fully integrated into the real-time electricity market. 

Helping to manage supply and demand more efficiently

These batteries can both charge and discharge power, helping to manage supply and demand more efficiently.

Until now, grid-scale batteries mainly supported the system by providing stability services. With SDP-02, they’ll be able to trade energy more actively, charging when renewable energy is abundant or prices are low, and discharging to supply power when demand is high, potentially replacing fossil fuel generation.

Operators will also be able to signal their preferred charging and discharging times, helping grid managers make smarter decisions about how to meet the island’s energy needs.

Energy minister Darragh O’Brien said: “The role of battery storage in Ireland’s energy needs is critical. The number of battery units operating in Ireland has increased over recent years, with more continuing to connect to the power system. These units will grow in importance as more variable renewable energy is brought onto the system. I welcome this update to increase the value and efficient utilisation of these battery units, supporting the transition to a low-carbon future by making the grid more flexible, efficient, and sustainable.”

Liam Ryan, chief transformation, technology and offshore officer at EirGrid, said: “Operating a power system with electricity generated from high levels of variable renewables, such as wind and solar, is complex and technically very challenging. There’s a need to overcome the limitations of many established technological and operational practices, while making sure the grid remains stable and secure. After extensive engagement with industry and stakeholders, we have introduced this update to allow market participants and the control centres to realise more value from battery units.”