The Hydrogen & Carbon Pipelines — The Molecule-Networks of the Energy Transition

We picture the energy transition as wind turbines and solar farms — the things that make clean power. But energy isn't only made; it's moved. And two molecules at the heart of the transition already travel the way oil and gas do: through pipelines. Hydrogen, the clean fuel itself, and carbon dioxide, the gas you capture so it doesn't reach the sky. This is the map of those lines — and it's a more honest, more surprising picture than the clean-energy story usually allows.

This guide is about what these networks really are, and why they look the way they do.

What these two molecules are doing

Everything here carries one of two things, and they're mirror images of each other.

Hydrogen is the clean fuel. Burn it, or run it through a fuel cell, and you get energy and water — no carbon dioxide. The hope is that it can do the hard-to-electrify jobs: heavy industry, steelmaking, long-haul shipping, perhaps aviation. On this map, today's hydrogen lines are mostly the unglamorous, already-existing kind: the merchant and industrial pipelines that move hydrogen between refineries and chemical plants, overwhelmingly along the US Gulf Coast, with the first European links beginning to appear.

Carbon dioxide is the other side of the coin. Instead of a fuel you move to a place, it's a waste gas you move away — captured from a smokestack or an industrial process and piped off to be stored underground, so it never warms the climate. That's the idea, anyway. The reality of today's CO₂ pipelines is stranger.

The honest truth about the CO₂ lines

Here's the thing almost nobody expects: most carbon-dioxide pipelines in the world today were built to produce more oil.

The technique is called enhanced oil recovery. When an oilfield ages, the easy oil stops flowing on its own. So operators pump pressurised CO₂ down into the rock, where it mixes with the trapped oil and pushes it toward the wells. The CO₂ isn't being buried for the climate — it's a tool for squeezing the last oil out of a depleting field.

That's why the longest CO₂ systems on this map — Denbury's Green Pipeline, the NEJD line, the lines fanning across the Permian Basin — run straight through America's great oil regions. They are oil-industry infrastructure that happens to carry CO₂.

Carbon capture and storage purely for the climate — taking CO₂ from a power plant or cement works and locking it away with no oil involved — is real and growing. Petra Nova in Texas, the Dakota Gasification plant piping CO₂ up to Canada, the Dutch capture projects on the North Sea coast. But it's the newer and much smaller use. So when you look at the slate-coloured lines on this map, read them honestly: mostly an oil tool, not yet a climate fix.

Why the map is almost all American

Toggle the layer on and one fact jumps out: it's nearly all in the United States, with a small cluster in NW-Europe and effectively nothing anywhere else.

Part of that is genuinely true. The US really does operate the world's largest built hydrogen and CO₂ pipeline networks — the Gulf-Coast hydrogen cluster and the Permian enhanced-oil-recovery system are the biggest of their kind on Earth. Part of it is mapping: OpenStreetMap covers US infrastructure thoroughly, and Europe's first links — around the port of Antwerp, along the Dutch coast — are mapped because they're new and noticed.

But the most important reason is what's missing. The hydrogen backbones Europe has announced, the big carbon-capture clusters planned for the UK, the Gulf and Asia — these are drawings and commitments, not yet steel in the ground. A map of built pipelines can't show a plan. So this is the network that exists in 2026, not the one the 2030s are supposed to bring.

Why we leave ammonia out

If you follow future-fuel debates, you'll have heard about ammonia — a way to carry hydrogen's energy across oceans without the difficulty of shipping hydrogen itself. So why isn't it here?

Honesty. The ammonia pipelines actually mapped in the world today are, overwhelmingly, old fertiliser lines — moving ammonia to farmland, where it's a long-established agricultural feedstock. That's a legacy industrial network, not energy-transition infrastructure. Including it under a banner of "future fuels" would dress up a fertiliser system as something it isn't. So the scope here stays on the two molecules whose pipelines genuinely belong to the transition story: hydrogen and CO₂.

How to read it alongside the fossil map

This layer is meant to be read against its sibling, the Energy Pipelines layer. That map shows the fuels the world burns now — gas, crude, refined products, sixteen thousand corridors thick. This one shows the molecules meant to clean up or replace that system — a couple of hundred corridors, mostly in one country, partly built by the oil industry.

Both come from the same source, filtered the same way, so the comparison is fair. And the honest punchline is the gap between them: the clean-energy network is, for now, small and lopsided and entangled with oil. That's not cause for cynicism — it's simply where the pipes actually run in 2026, before the promised networks are built. Watching that gap close, year by year, may turn out to be one of the clearest measures of whether the transition is real.