How big is South Korea's transmission network?

OverWatts maps 4,464 km of transmission line in South Korea, across 683 segments, plus 80 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 South Korea's grid?

Most of the mapped network is high voltage (220–379 kV): 3,995 km of 4,464 km. The highest voltage tagged anywhere in the country is 765 kV.

How complete is the grid map for South Korea?

Strong — 45.1 km of mapped line per 1,000 km² of land, ahead of 84% 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.

South Korea · electricity network

South Korea power grid

OverWatts maps 4,464 km of South Korea's electricity transmission network across 683 line segments and 80 substations, the 60th most-mapped grid of 153 countries. Its backbone is high voltage (220–379 kV), carrying 3,995 km — 89% of the mapped length, with the highest tagged voltage at 765 kV. That works out to 45.1 km per 1,000 km² of land — strong OpenStreetMap coverage, ahead of 84% of mapped countries.

Open the grid lens →South Korea profile →

4,464 km

Mapped transmission line

Substations

#60

of 153 mapped grids

765 kV

Highest voltage

OpenStreetMap coverage

Strong45.1 km / 1,000 km²ahead of 84% of 153 mapped countries

This grades how completely OpenStreetMap has drawn South Korea'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. 0% of segments carry a real line name and 0% an operator tag.

Mapped line length by voltage

≥765 kV468 km 10%
220–379 kV3,995 km 89%

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

On the interactive map

Open the interactive map →

Load against the network

128 GW

Operating generation

Data centres mapped

km of line per substation

45.1

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.

How South Korea compares · mapped grid by country

1. People's Republic of China624,300 km
58. Angola4,588 km
59. Czech Republic4,469 km
60. South Korea4,464 km
61. Paraguay4,411 km
62. Mozambique4,352 km

Frequently asked

How big is South Korea's transmission network?: OverWatts maps 4,464 km of transmission line in South Korea, across 683 segments, plus 80 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 South Korea's grid?: Most of the mapped network is high voltage (220–379 kV): 3,995 km of 4,464 km. The highest voltage tagged anywhere in the country is 765 kV.
How complete is the grid map for South Korea?: Strong — 45.1 km of mapped line per 1,000 km² of land, ahead of 84% 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.

Elsewhere in South Korea

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.