What Ireland’s batteries do and how they earn
The 27 batteries that trade in the all-island electricity market: how the fleet was built, what each battery does, how their owners earn, and what changes when DS3 contracts end.
From the market operator’s records and the companies’ own accounts. Autumn 2026, 22 pages, A4. Every figure is measured from a named source, and the sources are listed at the back. Revenue is reported for the fleet and for groups of batteries.
In brief
1,046 MW
in the 27 batteries that trade in the all-island market, October 2026.
SEMO registered capacity
64%
of that was built from 2020 to 2022. Since then, 375 MW in four years.
Vitreous battery register
82%
of half hours at zero output, 17 August to 14 October 2026.
SEMO plans, instructions and meter
€170,000 to €200,000
per megawatt a year in six owners’ latest accounts, nearly all of it from DS3 where the accounts split it out.
Company accounts
1,657 MW
of new stand-alone batteries with signed grid connections in Ireland, not yet built.
EirGrid and ESB Networks connection lists
30 Sep 2027
is the latest date DS3 tariffs can run. Daily auctions are to take over the reserve services.
SEM-25-031; SEM-23-103
What is inside
- 1What happenedHow the fleet was built, from 2020
- 2The fleet todayWhere the batteries are and who owns them
- 3What the batteries doHalf hour by half hour, against their own plans
- 4How they earnBalancing payments and the owners’ accounts, by group
- 5One batteryLisdrumdoagh, from the market operator’s records
- 6What happens nextWhat is decided, what is signed, and one modelled case
- 7What to watchFour measures for the 2027 edition