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Slovakia · electricity network

Slovakia power grid

OverWatts maps 2,207 km of Slovakia's electricity transmission network across 289 line segments and 23 substations, the 84th most-mapped grid of 153 countries. Its backbone is extra-high voltage (380–764 kV), carrying 1,774 km — 80% of the mapped length, with the highest tagged voltage at 400 kV. That works out to 47 km per 1,000 km² of land — strong OpenStreetMap coverage, ahead of 86% of mapped countries. It is connected to 4 neighbouring grids by 6,230 MW of existing cross-border transfer capacity, with a further 2,300 MW planned.

Open the grid lens →Slovakia profile →
2,207 km
Mapped transmission line
23
Substations
#84
of 153 mapped grids
6.2 GW
cross-border · 4 neighbours
400 kV
Highest voltage

OpenStreetMap coverage

Strong47 km / 1,000 km²ahead of 86% of 153 mapped countries

This grades how completely OpenStreetMap has drawn Slovakia'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. 24% of segments carry a real line name and 34% an operator tag.

Mapped line length by voltage

289 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 Slovakia

6.2 GW existing · 2.3 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

5.3 GW
Operating generation
96
km of line per substation
47
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 Slovakia's network

Segment counts from OSM `operator` tags, merged across spellings. Present on 34% of segments — this ranks who is recorded, not market share.

How Slovakia compares · mapped grid by country

Frequently asked

How big is Slovakia's transmission network?
OverWatts maps 2,207 km of transmission line in Slovakia, across 289 segments, plus 23 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 Slovakia's grid?
Most of the mapped network is extra-high voltage (380–764 kV): 1,774 km of 2,207 km. The highest voltage tagged anywhere in the country is 400 kV.
How complete is the grid map for Slovakia?
Strong — 47 km of mapped line per 1,000 km² of land, ahead of 86% 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 Slovakia?
SEPS, SEPS / MAVIR, Slovenská elektrizačná prenosová sústava and 3 others are tagged as operators on mapped segments. Operator tags are present on 34% of Slovakia's segments, so this ranks who is *recorded*, not market share.
What interconnectors connect Slovakia to its neighbours?
6,230 MW of cross-border transfer capacity to Poland, Czech Republic, Hungary, Ukraine, plus 2,300 MW planned. Capacities are from the Global Transmission Database (v1.0, 2023).

Elsewhere in Slovakia

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.