How big is the Czech Republic's transmission network?

OverWatts maps 4,469 km of transmission line in the Czech Republic, across 707 segments, plus 33 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 the Czech Republic's grid?

Most of the mapped network is extra-high voltage (380–764 kV): 3,238 km of 4,469 km. The highest voltage tagged anywhere in the country is 400 kV.

Who operates the grid in the Czech Republic?

ČEPS, 50Hertz Transmission, ČEZ and 5 others are tagged as operators on mapped segments. Operator tags are present on 69% of the Czech Republic's segments, so this ranks who is *recorded*, not market share.

What interconnectors connect the Czech Republic to its neighbours?

5,700 MW of cross-border transfer capacity to Slovakia, Germany, Poland, Austria, plus 2,150 MW planned. Capacities are from the Global Transmission Database (v1.0, 2023).

Czech Republic · electricity network

Czech Republic power grid

Q: How complete is the grid map for the Czech Republic?

Strong — 55.2 km of mapped line per 1,000 km² of land, ahead of 90% 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.

OverWatts maps 4,469 km of the Czech Republic's electricity transmission network across 707 line segments and 33 substations, the 59th most-mapped grid of 153 countries. Its backbone is extra-high voltage (380–764 kV), carrying 3,238 km — 72% of the mapped length, with the highest tagged voltage at 400 kV. That works out to 55.2 km per 1,000 km² of land — strong OpenStreetMap coverage, ahead of 90% of mapped countries. It is connected to 4 neighbouring grids by 5,700 MW of existing cross-border transfer capacity, with a further 2,150 MW planned.

Open the grid lens →Czech Republic profile →

4,469 km

Mapped transmission line

Substations

#59

of 153 mapped grids

5.7 GW

cross-border · 4 neighbours

400 kV

Highest voltage

OpenStreetMap coverage

Strong55.2 km / 1,000 km²ahead of 90% of 153 mapped countries

This grades how completely OpenStreetMap has drawn the Czech Republic'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. 15% of segments carry a real line name and 69% an operator tag.

Mapped line length by voltage

380–764 kV3,238 km 72%
220–379 kV1,230 km 28%
<220 kV1 km 0%

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

5.7 GW existing · 2.1 GW planned · capacities from the Global Transmission Database v0.1 (CC BY 4.0), existing as of 2023

On the interactive map

Open the interactive map →

Load against the network

13.9 GW

Operating generation

135

km of line per substation

55.2

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.

Segment counts from OSM `operator` tags, merged across spellings. Present on 69% of segments — this ranks who is recorded, not market share.

How the Czech Republic compares · mapped grid by country

1. People's Republic of China624,300 km
57. Bulgaria4,909 km
58. Angola4,588 km
59. Czech Republic4,469 km
60. South Korea4,464 km
61. Paraguay4,411 km

Frequently asked

How big is the Czech Republic's transmission network?: OverWatts maps 4,469 km of transmission line in the Czech Republic, across 707 segments, plus 33 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 the Czech Republic's grid?: Most of the mapped network is extra-high voltage (380–764 kV): 3,238 km of 4,469 km. The highest voltage tagged anywhere in the country is 400 kV.
How complete is the grid map for the Czech Republic?: Strong — 55.2 km of mapped line per 1,000 km² of land, ahead of 90% 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 the Czech Republic?: ČEPS, 50Hertz Transmission, ČEZ and 5 others are tagged as operators on mapped segments. Operator tags are present on 69% of the Czech Republic's segments, so this ranks who is *recorded*, not market share.
What interconnectors connect the Czech Republic to its neighbours?: 5,700 MW of cross-border transfer capacity to Slovakia, Germany, Poland, Austria, plus 2,150 MW planned. Capacities are from the Global Transmission Database (v1.0, 2023).

Elsewhere in the Czech Republic

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.