How big is Belgium's transmission network?

OverWatts maps 1,090 km of transmission line in Belgium, across 615 segments, plus 31 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 Belgium's grid?

Most of the mapped network is extra-high voltage (380–764 kV): 881 km of 1,090 km. The highest voltage tagged anywhere in the country is 400 kV.

How complete is the grid map for Belgium?

Strong — 36.3 km of mapped line per 1,000 km² of land, ahead of 76% 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 Belgium?

Elia, RTE are tagged as operators on mapped segments. Operator tags are present on 47% of Belgium's segments, so this ranks who is *recorded*, not market share.

What interconnectors connect Belgium to its neighbours?

7,880 MW of cross-border transfer capacity to France, Netherlands, Germany, United Kingdom, Luxembourg, plus 10,800 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.

Belgium · electricity network

Belgium power grid

OverWatts maps 1,090 km of Belgium's electricity transmission network across 615 line segments and 31 substations, the 107th most-mapped grid of 153 countries. Its backbone is extra-high voltage (380–764 kV), carrying 881 km — 81% of the mapped length, with the highest tagged voltage at 400 kV. That works out to 36.3 km per 1,000 km² of land — strong OpenStreetMap coverage, ahead of 76% of mapped countries. It is connected to 5 neighbouring grids by 7,880 MW of existing cross-border transfer capacity, with a further 10,800 MW planned.

Open the grid lens →Belgium profile →

1,090 km

Mapped transmission line

Substations

#107

of 153 mapped grids

7.9 GW

cross-border · 5 neighbours

400 kV

Highest voltage

OpenStreetMap coverage

Strong36.3 km / 1,000 km²ahead of 76% of 153 mapped countries

This grades how completely OpenStreetMap has drawn Belgium'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. 6% of segments carry a real line name and 47% an operator tag.

Mapped line length by voltage

380–764 kV881 km 81%
220–379 kV208 km 19%

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

7.9 GW existing · 10.8 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

Open the interactive map →

Load against the network

13.4 GW

Operating generation

km of line per substation

36.3

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 Belgium's network

Elia213 74%
RTE76 26%

Segment counts from OSM `operator` tags, merged across spellings. Present on 47% of segments — this ranks who is recorded, not market share.

How Belgium compares · mapped grid by country

1. People's Republic of China624,300 km
105. Albania1,160 km
106. Denmark1,149 km
107. Belgium1,090 km
108. Iceland1,075 km
109. Nepal1,041 km

Frequently asked

How big is Belgium's transmission network?: OverWatts maps 1,090 km of transmission line in Belgium, across 615 segments, plus 31 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 Belgium's grid?: Most of the mapped network is extra-high voltage (380–764 kV): 881 km of 1,090 km. The highest voltage tagged anywhere in the country is 400 kV.
How complete is the grid map for Belgium?: Strong — 36.3 km of mapped line per 1,000 km² of land, ahead of 76% 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 Belgium?: Elia, RTE are tagged as operators on mapped segments. Operator tags are present on 47% of Belgium's segments, so this ranks who is *recorded*, not market share.
What interconnectors connect Belgium to its neighbours?: 7,880 MW of cross-border transfer capacity to France, Netherlands, Germany, United Kingdom, Luxembourg, plus 10,800 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 Belgium

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.