How Energy Moves by Pipeline — The Other Half of the Energy Map

We tend to picture the world’s energy as electricity — the grid, the wires, the glow of a city at night. But most of the energy people actually use never travels as electricity at all. It moves as molecules in a pipe: natural gas pushed across a continent to a power station, crude oil flowing to a refinery, finished fuel sent on to the depot that fills the tankers. This is the other half of how energy moves, and it has its own map — the great trunk pipelines, drawn here and coloured by what they carry.

This guide is about what those lines are doing, and how to read them.

What pipelines carry

Every pipeline on this map is sorted into one of three things it might be carrying, because that — far more than its length or location — is what tells you its job.

Natural gas is the overwhelming majority. Gas is difficult to move any other way: you can’t easily put it on a truck or a train the way you can a barrel of oil, so pipelines are simply how gas gets anywhere. They carry it from gas fields to power stations, to industry, and into the networks that eventually reach homes. On the map, gas is the dominant colour for a reason — it’s most of what the world’s pipelines do.

Crude oil is the next layer. These lines move unrefined oil — straight from the field or the terminal — to the refineries that turn it into something useful. They tend to be fewer and heavier, the trunk routes of the oil industry, and some of the longest single systems on the map are crude lines hauling oil across whole countries.

Refined products are the finished fuels: petrol, diesel, jet fuel, the things that come out of a refinery. Product pipelines carry them onward — to fuel terminals, to airports, to the distribution points where they enter everyday use. They represent the last long-distance leg before fuel reaches the local network.

Together the three colours read as a story: oil in, fuel out, gas threading through all of it.

Trunk lines, not the mains

The single most important thing to understand about this map is what it leaves off.

What you’re seeing is the transmission tier only — the long-distance trunk pipelines, the energy equivalent of motorways. They move large volumes between regions, across borders, sometimes across continents. Beneath them, invisible here, lies a far larger web of distribution mains: the smaller pipes that branch off to feed individual streets, buildings and meters. Those local lines are the energy equivalent of residential roads — vastly more numerous than the trunk routes, and intensely local.

Showing only the transmission tier is a deliberate choice. It keeps the map to the major arteries of how energy moves between places, rather than the fine plumbing of any one town. The result is a map of the world’s energy backbone — the great lines that matter at the scale of countries — and not an operational diagram of anyone’s neighbourhood.

Why colour by cargo, not size

You might expect a pipeline map to grade its lines by thickness — fat lines for the big pipes, thin ones for the small. It doesn’t, and the reason is honesty about the data.

In the open data behind this map, almost every pipeline records what it carries. That field is well-filled and reliable, so colouring by cargo reflects something genuinely known about each line. The pipe’s diameter, on the other hand, is recorded for only a minority of lines. Grading the map by width would therefore mean either inventing a thickness for most pipelines or leaving large, ugly gaps where the data runs out.

Rather than fake a number it doesn’t have, the map keeps every line the same weight and lets colour carry the meaning. It’s a small decision that reflects a larger principle: show what’s actually recorded, not a guess dressed up as data.

Why the US and Europe fill the map

One pattern jumps out immediately: the map is dense across the United States and Europe and comparatively sparse almost everywhere else. It’s important to read that correctly.

This is a mapping pattern, not a true census. The data comes from OpenStreetMap, built by volunteers, and roughly nineteen out of every twenty mapped pipeline corridors fall in North America and Europe — with the US alone making up about half of everything shown. That tells you where the mapping work has been done, not where all the world’s pipelines are.

In reality, some of the largest pipeline networks on Earth run through Russia, the Middle East, and across China and East Asia. They’re real, they’re vast, and they’re only lightly mapped at this tier — so on this map they appear far thinner than they truly are. The empty spaces are gaps in the record, not gaps in the ground. It’s the same honest caveat that comes with any map built from open, volunteer data: it’s a real picture of what’s been mapped, not a complete picture of what exists.

What the map shows — and what it doesn’t

A few limits, stated plainly. This is the major transmission pipelines mapped in OpenStreetMap — the long-distance gas, crude and refined-product trunk lines. It is not the local distribution network, and it is not a complete global register of every pipeline. Every line shown is a real feature a mapper has recorded and tagged with what it carries; nothing here is invented. But coverage follows the mapping, densest in the US and Europe, so it’s the mapped backbone rather than the whole of it.

What it offers, though, is a view most energy maps skip entirely — not the wires, but the pipes; not the electrons, but the molecules that do most of the actual work of moving energy around the world. Open the live map and turn on the pipelines layer to see it alongside the electricity grid: the two halves of how energy gets from where it’s made to where it’s used.