Ireland: the live status of the all-island electricity system

The island of Ireland runs a single, synchronous grid spanning both jurisdictions - the Republic of Ireland and Northern Ireland - balanced together as the Single Electricity Market (SEM) by EirGrid and SONI. It is one of the windiest grids in Europe and has to manage that without the cushioning of a large synchronous neighbour.

Data as of Loading live data…

SEM day-ahead price
€–/MWh
SEM imbalance price
€–/MWh
Emissions
–g/kWh
Demand
–GW
Generation
–GW
GB interconnect
–GW

Each figure’s trend line covers the last 3 hours. See data sources.

Generation mix right now

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SourceGW%
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    Generation by source right now, ranked highest to lowest.

    Fuel mix over the last 24 hours

    EirGrid's own fuel mix for the last 24 hours. Figures appear here when the next reading arrives.

    Generation mix over the last 24 hours

      Wind so often dominates Ireland's mix that gas output usually moves in the opposite direction, hour by hour. From EirGrid's Smart Grid Dashboard. Gas and other (calculated) is total generation minus wind and solar.

      History

      Choose a time range to see how demand, generation, price, emissions and interconnection have changed - every measure, side by side.

      About the all-island system

      Ireland and Northern Ireland share a single synchronous electricity system, kept in step at 50Hz across the border since before partition. Since 2018 the two jurisdictions have traded through the Integrated Single Electricity Market (I-SEM), aligned with EU-wide market coupling.

      Because the island is a relatively small, isolated synchronous area with no large neighbouring grid to lean on, EirGrid manages a constraint unique among Europe's major systems: System Non-Synchronous Penetration (SNSP), the instantaneous share of demand that can be met by wind, solar and interconnectors (all "non-synchronous" sources) without risking system stability. That limit has been raised in stages from 50% a decade ago to the current 75% (reached in March 2022, as the "DS3" programme's goal), and EirGrid is now working to gradually raise it further to a 95% target, adding synchronous condensers and faster reserves along the way to keep the system stable at high wind penetration.

      Ireland closed its ESB peat-fired power stations in 2020, with the last peat-fired generation (Edenderry) ending in 2023 - well ahead of most of Europe's coal phase-out, and Moneypoint - once the country's largest fossil fuel plant - has been retained only for emergency winter backup while it is redeveloped as a green energy hub.

      Records

      • Highest wind generation (Republic of Ireland)3,898MW - 14 February 2026, 5.50pm
      • Highest grid-scale solar output1,222MW - 25 May 2026 (first above 1GW on 20 April 2026)
      • Republic of Ireland peak demand record6,024MW - 8 January 2025 (also a record 119.3GWh that day)
      • Battery discharge record396MW - 15 December 2025
      • SNSP operating limit75% - unchanged since 2022, with a 95% target still ahead
      • Last peat-fired generationEnd of 2023 (Edenderry)

      The SNSP limit - the ceiling on wind, solar and interconnector share at any instant - raised in stages as the grid has been reinforced, with a 95% target still ahead.

      Sources: EirGrid - records in the first half of 2026, demand records, December 2025 and DS3/SNSP; Bord na Móna (peat). Last checked: 2 October 2026.

      Data sources for Ireland

      The Elexon Insights Solution, NESO Data Portal and Carbon Intensity API that power the Great Britain pages only cover the GB transmission system, so they cannot be reused here. This page instead draws on:

      • EirGrid Group's Smart Grid Dashboard - live for demand, total generation, wind, solar, GB interconnection and carbon intensity across the island of Ireland, and for the generation mix: right now, over the last 24 hours, and EirGrid's own 24-hour fuel mix.
      • SONI - EirGrid's Northern Ireland transmission system operator counterpart, covered within the same all-island figures.
      • SEMO (Single Electricity Market Operator) - now wired up live for the "SEM imbalance price" stat above: the real, ex-post settlement price at 5-minute granularity, via SEMO's own public, keyless Reports API (report BM-025, "Imbalance Price Report"). This is genuinely different from the day-ahead price below - it is what generators/suppliers are actually paid or charged for being out of balance with their day-ahead position, not the price agreed the day before. SEMO also publishes the day-ahead price itself, but this site gets that via ENTSO-E instead (see below), since it already needed that feed for the generation mix.
      • ENTSO-E Transparency Platform - the pan-European grid data hub. Powers the SEM day-ahead price stat and the History section's price panel above, via its Ireland (SEM) bidding zone. For the generation mix it supplies hydro, peat and the other smaller types it publishes for Ireland. It is not used for wind or gas: in near real time it carries no gas for Ireland, and EirGrid's own wind figure is more up to date. Requires the site operator's own free API token - shows "not available"/"not enough recorded history yet" rather than a placeholder figure if one is not set or ingestion has not run yet.

      EirGrid publishes total generation, wind and solar in real time, but not gas, oil or batteries separately. The mix adds ENTSO-E's hydro and peat figures (left out if they are more than 6 hours older than EirGrid's) and shows what is left of EirGrid's total as one calculated "gas and other" figure. GB interconnection is EirGrid's net figure across Moyle, EWIC and Greenlink. Each chart shows "not enough recorded history yet" rather than a placeholder if this install has not collected enough history for a given range.