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Ireland · electricity network

Ireland power grid

OverWatts maps 1,923 km of Ireland's electricity transmission network across 428 line segments and 5 substations, the 91st most-mapped grid of 153 countries. Its backbone is high voltage (220–379 kV), carrying 1,555 km — 81% of the mapped length, with the highest tagged voltage at 400 kV. That works out to 32.9 km per 1,000 km² of land — moderate OpenStreetMap coverage, ahead of 72% of mapped countries. It is connected to 1 neighbouring grid by 630 MW of existing cross-border transfer capacity, with a further 3,070 MW planned.

Open the grid lens →Ireland profile →
1,923 km
Mapped transmission line
5
Substations
#91
of 153 mapped grids
630 MW
cross-border · 1 neighbours
400 kV
Highest voltage

OpenStreetMap coverage

Moderate32.9 km / 1,000 km²ahead of 72% of 153 mapped countries

This grades how completely OpenStreetMap has drawn Ireland's network — not how much network exists. Large, sparsely-populated countries score low for geographic reasons alone, and every kilometre here is mapped length, so the totals are a floor rather than an operator-reported figure. 36% of segments carry a real line name and 100% an operator tag.

Mapped line length by voltage

428 segments · a segment is credited to the country containing its midpoint, so a border-crossing line counts once, on one side.

Cross-border links from Ireland

630 MW existing · 3.1 GW planned · capacities from the Global Transmission Database v0.1 (CC BY 4.0), existing as of 2023 · GB cable flow every five minutes · Contains BMRS data © Elexon Limited copyright and database right 2026

On the interactive map

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Load against the network

7.4 GW
Operating generation
1
Data centres mapped
385
km of line per substation
32.9
km per 1,000 km²

Where there is room to connect a new load depends on published hosting capacity, which most operators release only as their own map. OverWatts does not yet ingest those feeds, so these are the density measures the open data supports — generation and mapped demand against mapped network — not a headroom figure.

Operators tagged on Ireland's network

Segment counts from OSM `operator` tags, merged across spellings. Present on 100% of segments — this ranks who is recorded, not market share.

How Ireland compares · mapped grid by country

Frequently asked

How big is Ireland's transmission network?
OverWatts maps 1,923 km of transmission line in Ireland, across 428 segments, plus 5 substations. This is mapped length from OpenStreetMap, not an operator-reported total — where OSM is incomplete the figure is a floor, never a ceiling.
What voltage is Ireland's grid?
Most of the mapped network is high voltage (220–379 kV): 1,555 km of 1,923 km. The highest voltage tagged anywhere in the country is 400 kV.
How complete is the grid map for Ireland?
Moderate — 32.9 km of mapped line per 1,000 km² of land, ahead of 72% of the 153 countries with any mapped grid. Coverage grades how completely OpenStreetMap has drawn the network, not how much network exists; large, sparsely-populated countries score low for geographic reasons alone.
Who operates the grid in Ireland?
EirGrid are tagged as operators on mapped segments. Operator tags are present on 100% of Ireland's segments, so this ranks who is *recorded*, not market share.
What interconnectors connect Ireland to its neighbours?
630 MW of cross-border transfer capacity to United Kingdom, plus 3,070 MW planned. Capacities are from the Global Transmission Database (v1.0, 2023); flow over the GB cables is published live every five minutes by Elexon.

Elsewhere in Ireland

Transmission linesSubstationsPower plantsData centres

Network geometry: OpenStreetMap (ODbL) © OpenStreetMap contributors, ingested and measured by OverWatts · derived 2026-07-26. Counts every mapped line of 220 kV and above; the map layer draws the ≥380 kV backbone only, so it shows less than is measured here.