How big is Greece's transmission network?

OverWatts maps 3,062 km of transmission line in Greece, across 348 segments, plus 22 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 Greece's grid?

Most of the mapped network is extra-high voltage (380–764 kV): 3,062 km of 3,062 km. The highest voltage tagged anywhere in the country is 400 kV.

How complete is the grid map for Greece?

Moderate — 23.2 km of mapped line per 1,000 km² of land, ahead of 62% 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 Greece?

IPTO are tagged as operators on mapped segments. Operator tags are present on 16% of Greece's segments, so this ranks who is *recorded*, not market share.

What interconnectors connect Greece to its neighbours?

3,760 MW of cross-border transfer capacity to Bulgaria, North Macedonia, Turkey, Italy, Albania, plus 11,530 MW planned. Capacities are from the Global Transmission Database (v1.0, 2023).

Greece · electricity network

Greece power grid

OverWatts maps 3,062 km of Greece's electricity transmission network across 348 line segments and 22 substations, the 74th most-mapped grid of 153 countries. Its backbone is extra-high voltage (380–764 kV), carrying 3,062 km — 100% of the mapped length, with the highest tagged voltage at 400 kV. That works out to 23.2 km per 1,000 km² of land — moderate OpenStreetMap coverage, ahead of 62% of mapped countries. It is connected to 5 neighbouring grids by 3,760 MW of existing cross-border transfer capacity, with a further 11,530 MW planned.

Open the grid lens →Greece profile →

3,062 km

Mapped transmission line

Substations

#74

of 153 mapped grids

3.8 GW

cross-border · 5 neighbours

400 kV

Highest voltage

OpenStreetMap coverage

Moderate23.2 km / 1,000 km²ahead of 62% of 153 mapped countries

This grades how completely OpenStreetMap has drawn Greece'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. 3% of segments carry a real line name and 16% an operator tag.

Mapped line length by voltage

380–764 kV3,062 km 100%

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

3.8 GW existing · 11.5 GW planned · capacities from the Global Transmission Database v0.1 (CC BY 4.0), existing as of 2023

On the interactive map

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Load against the network

13.7 GW

Operating generation

139

km of line per substation

23.2

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 Greece's network

IPTO56 100%

Segment counts from OSM `operator` tags, merged across spellings. Present on 16% of segments — this ranks who is recorded, not market share.

How Greece compares · mapped grid by country

1. People's Republic of China624,300 km
72. Austria3,221 km
73. Laos3,200 km
74. Greece3,062 km
75. Ecuador3,012 km
76. Tajikistan2,890 km

Frequently asked

How big is Greece's transmission network?: OverWatts maps 3,062 km of transmission line in Greece, across 348 segments, plus 22 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 Greece's grid?: Most of the mapped network is extra-high voltage (380–764 kV): 3,062 km of 3,062 km. The highest voltage tagged anywhere in the country is 400 kV.
How complete is the grid map for Greece?: Moderate — 23.2 km of mapped line per 1,000 km² of land, ahead of 62% 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 Greece?: IPTO are tagged as operators on mapped segments. Operator tags are present on 16% of Greece's segments, so this ranks who is *recorded*, not market share.
What interconnectors connect Greece to its neighbours?: 3,760 MW of cross-border transfer capacity to Bulgaria, North Macedonia, Turkey, Italy, Albania, plus 11,530 MW planned. Capacities are from the Global Transmission Database (v1.0, 2023).

Elsewhere in Greece

Transmission lines Substations Power plants Data 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.