GRID · FIELD GUIDE
How Much Land the Power Grid Needs — Rights-of-Way, Explained
A transmission line looks like it takes up almost nothing — a row of towers and some wire in the sky. But every one of those lines sits inside a legally cleared corridor of land that nothing else is allowed to occupy, and across an entire continent that adds up fast. This guide is about the land cost of moving electricity: what a right-of-way is, why it widens with voltage, and how much ground the grid really takes.
Look up at a transmission line and it seems to cost the landscape almost nothing: a row of steel towers, some wire, a lot of sky. But that line is sitting inside a corridor of land that has been deliberately cleared and is legally kept that way — no buildings, no tall trees, nothing that could foul the conductors or block the crews who maintain them. That corridor is the line's right-of-way, and it is the real way the grid touches the ground.
This guide is about that hidden footprint: what a right-of-way is, why it gets wider as the voltage climbs, and — when you add every corridor together — just how much land the high-voltage grid quietly occupies.
A line is a corridor, not a wire
The first thing to unlearn is that a power line is a thin object. Legally and physically, it's a strip. The utility holds an easement — a right to use and keep clear a band of land of a defined width, centred on the line — even where the land underneath belongs to a farmer, a town or a private owner. Within that band the owner typically keeps the title and can often still graze animals or grow low crops, but they can't build a house, run a road of structures, or let a forest grow up into the wires.
Why so strict? Because the things a right-of-way keeps out are exactly the things that cause power lines to fail. A tree growing into a high-voltage conductor is one of the classic triggers of large blackouts — vegetation contact has set off some of the biggest cascading outages on record. Keeping a clear, accessible corridor is how the grid stays both safe and repairable.
Why the corridor widens with voltage
Here's the part that surprises people: the corridor isn't a fixed width. A modest 132 kV line might need a strip around 25 to 30 metres wide; a 400 kV line wants something closer to 50; and a 765 kV ultra-high-voltage line can need 80 metres or more. The width roughly doubles from the lowest backbone voltages to the highest. Two forces drive that.
The first is electrical clearance. High voltage can arc across an air gap, and the higher the voltage, the bigger the gap it can jump. To stop the live conductors flashing over to a tree, a vehicle, a building or the ground, they have to stay a safe distance from everything — and that safe distance grows with voltage. A wider corridor is how you guarantee it.
The second is physical size. A higher-voltage line is simply a bigger machine. Its towers are taller — the largest can top 50 metres — so the conductors hang higher and sweep across more ground as they sag in the heat and swing in the wind. Big lines also split each electrical phase into several conductors held apart by spacers (it reduces losses and noise), so the whole bundle is physically broader. Taller, wider, swinging further: all of it needs more cleared room.
So the corridor width is really a readout of voltage — which is exactly how the land corridors layer draws it, shading each line's corridor wider as the voltage climbs.
Adding it all up
One corridor is easy to ignore. A continent of them is not.
Take the high-voltage backbone that OpenStreetMap has mapped — more than 1.2 million kilometres of line at 300 kV and above — and apply a typical easement width for each voltage class, and the grid's rights-of-way come to roughly 74,000 square kilometres. That's about the size of Panama, or Ireland, or a touch larger than Scotland: a small country's worth of land, given over to the corridors that carry electricity.
A few things are worth saying plainly about that number. It's the transmission tier only — the long-distance backbone — and not the far larger web of lower-voltage distribution lines down every street, which would dwarf it. It's an estimate built from typical widths, not a survey of each easement. And it's only the part of the grid that's been mapped; the real total is larger. But even as a careful estimate it makes the point: moving electricity has a land cost, and it's not small.
That cost is also growing. Every new line built to connect a wind or solar farm, to strengthen a strained network, or to tie two countries together claims a new corridor. The land take of the grid is one of the quiet, cumulative prices of electrification — and one of the reasons new transmission is so often slow and contested to build.
Why not just bury it?
The obvious escape is to put the lines underground and reclaim the surface. Sometimes that's exactly what happens — in cities, across valued landscapes, near airports. But undergrounding isn't free of land or cost. Buried transmission cable can run several times the price of an overhead line per kilometre, still needs its own cleared trench corridor that you can't build over, and is far slower and more disruptive to repair when a fault occurs. At the very highest voltages, long underground AC links also hit electrical limits that overhead lines don't.
So while burying is rising where the land is most valuable, the long-distance backbone stays overwhelmingly in the air — which is why the right-of-way remains the grid's defining footprint on the ground.
How to read the layer
On the map, switch on Land Corridors and the high-voltage lines gain a soft halo — the corridor each one runs down — widening with voltage so the ultra-high-voltage super-grids show the broadest strips. Switch on Transmission as well and you can see the crisp wire sitting inside its band of land.
One honest caveat, stated on the map and the layer page: that halo is illustrative. A real 40-to-85-metre easement is finer than a pixel until you zoom in close, so drawing it to true scale would make it vanish. The halo is a symbol of the right-of-way — sized to show which lines take more land — not a measurement of the strip itself. For the real typical widths and the land-area estimate built from them, head to the land corridors layer.
Frequently asked questions
What is a power-line right-of-way?
A right-of-way (also called an easement or, in some countries, a wayleave) is a strip of land along a power line that the utility has the legal right to keep clear and access, even when someone else owns the land. Inside it, tall trees and buildings aren't allowed, because they could interfere with the conductors or block access to the towers. The landowner usually keeps the title and can often farm or graze the strip, but they can't build on it or let it grow up into forest. It's the physical footprint of the line: not just where the towers stand, but the whole cleared corridor they run down.
Why do higher-voltage lines need wider corridors?
Two reasons, both about keeping the electricity where it belongs. First, high voltage can jump a gap — the higher the voltage, the further a live conductor has to stay from trees, structures and the ground to stop it arcing across, so the corridor has to be wider to hold that clearance. Second, bigger lines are physically bigger: a 765 kV line hangs from towers that can be 50 metres tall or more, its conductors sag and swing in the wind across a wide band, and it often carries several conductors per phase spread apart. Put together, a 220 kV line might need a corridor around 30 metres wide while a 765 kV line can need 80 metres or more — roughly double — for the same single line.
How much land does the grid actually take?
More than you'd guess from looking up at a single line. Our map estimates that just the high-voltage backbone that OpenStreetMap has mapped — over a million kilometres of line at 300 kV and above — occupies on the order of 74,000 square kilometres of right-of-way, which is about the area of Panama or Ireland. And that's only the long-distance transmission tier; it doesn't count the vastly larger network of lower-voltage distribution lines that thread down every street. The land take of the grid is one of the quiet costs of electrification, and it grows every time a new line is built to connect renewables or feed demand.
Why can't the lines just be buried to save the land?
Sometimes they are — but burying high-voltage lines is expensive and has its own land footprint. Underground cables at transmission voltages can cost several times as much as overhead lines per kilometre, need their own cleared trench corridor (you still can't plant trees over them or build on them), and are far harder to repair when something fails. For the highest voltages, especially long-distance AC lines, undergrounding runs into electrical limits too. So while cities and sensitive landscapes increasingly bury lines, the long-distance backbone is still overwhelmingly overhead — which is why rights-of-way remain the grid's main land cost.
Are the corridor widths on the map drawn to scale?
No, and we badge them as illustrative. A real right-of-way is something like 40 to 85 metres wide depending on voltage — which is finer than a single pixel until you zoom right in, so a true-to-scale corridor would simply be invisible at the zoom most people view the map. Instead the map draws a soft halo whose width is a symbol of the easement, widening with voltage class so you can see which lines take more land, not a measurement of the strip on the ground. The real typical widths, and the land-area estimate built from them, are on the layer's page — drawn from published easement norms, which themselves vary by terrain, tower design and country.
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