1,049 MW of batteries are registered in the all-island market. 3,838 MW more hold a signed connection agreement and are not yet energised.

Where the batteries are

One circle per battery, sized by capacity. Yellow is in the market; blue holds a connection agreement and is not yet energised.

64 of 73 batteries placed: 58 at a substation mapped in OpenStreetMap, 6 at the place GeoNames gives the name, 9 not placed. A market unit is placed by the place in its name, a contracted battery by its station; none of the registers prints coordinates.

Every battery in the market

SEMO’s Registered Capacity report of Oct 2026, fuel type battery storage, with the month each unit registered from SEMO’s daily list. Where a unit is also on ESB Networks’ energised list the row names that entry; the two are one battery. One more energised battery on ESB Networks’ list, 0.4 MW, is not a unit in the market and is counted beside it, not in it. Golagh Battery is included by hand: SEMO files the unit as multi-fuel, but it is a 3 MW battery: the CRU authorised it as battery storage (Auth 2020/06-01, Barnesmore, Co. Donegal), Donegal planning 19/50357 consented it as a battery, and SEMO's own List of Registered Units of October 2024 gave it the fuel type BATTERY.

Arrivals, by the year a unit registered

The owners with the most in the market

What a contract means here

A contracted generator has signed a connection agreement with the system operator and is committed to exporting at a future date. That is a firmer thing than a place in Great Britain’s queue, where most of the capacity has no agreement at all. Ireland processes applications in batches under its Enduring Connection Policy, ECP-2.1 to ECP-2.5, and the batch each battery came through is in the table.

Contracted, by batch

The stations with the most contracted battery capacity

What is not here, and why

Who built each battery and whose cells are in it, because no register says; that is read battery by battery from what the owners and planners published, and arrives as it is found. Northern Ireland’s own connection lists, because SONI’s register and NIE Networks’ lists have moved since 2024 and have not yet been found at a stable address; its market units are here. What each battery earns, because the market’s unit data is not yet read. The 1,049 MW in the market and the 3,838 MW contracted are two lists that do not overlap by construction: a contracted battery leaves EirGrid’s list when it is energised and appears in SEMO’s when it registers.

Sources: SEMO, Registered Capacity report of Oct 2026 and List of Registered Units, from its public reports service, fuel type battery storage; SEMO filed batteries under that fuel type from its December 2025 report, and under multi-fuel before. EirGrid, Contracted TSO (Wind) and (Non-Wind) Generators, correct as of 5 August 2026; ESB Networks, Distribution Contracted and Energised Generators and Live Connection Assessments, correct as of 1 July 2026. Each PDF list is read into a table and checked against the total the list itself prints. Nothing on this page is modelled.