Carbon capture for industry

Energy & decarbonization · 9 min read · Updated 2026-05-30

How industrial carbon capture works, where it fits versus efficiency and fuel switching, capture methods, the energy penalty, and transport and storage.

What carbon capture is and where it fits

Carbon capture separates carbon dioxide from a gas stream so it can be stored or used instead of released to atmosphere. For industry it offers a way to cut emissions from processes that cannot easily avoid producing carbon dioxide in the first place. But it is energy-intensive and costly, so it is not the first tool to reach for.

The sensible order is a hierarchy: first cut energy demand through efficiency, then switch to lower-carbon energy and fuels, and only then apply capture to the emissions that remain. Capture is the answer for the residual — particularly the carbon dioxide that comes from the chemistry of a process, not from burning fuel.

Process emissions that cannot be electrified away

Some industrial emissions do not come from energy use at all. They are released by the chemical reactions at the heart of the process — for example when certain minerals are processed and give off carbon dioxide as part of the reaction. Switching to clean electricity or hydrogen for the heat does nothing about these process emissions, because they are inherent to the product chemistry.

For such processes, carbon capture is one of the few routes to deep decarbonisation. This is why capture is most discussed for a specific set of heavy industries: their emissions cannot simply be electrified or fuel-switched away. Identifying how much of a site's emissions are process-inherent versus energy-related is the key to knowing whether capture is even relevant.

Capture methods

There are three broad approaches to capturing carbon dioxide from industrial sources:

• Post-combustion capture — the carbon dioxide is separated from the flue gas after combustion, most commonly by absorbing it into a solvent and then releasing it with heat. This can be retrofitted to existing plant and is the most mature route.
• Pre-combustion capture — the fuel is converted to hydrogen and carbon dioxide before burning, and the carbon dioxide is separated before the hydrogen is used.
• Oxy-fuel combustion — fuel is burned in oxygen rather than air, producing a flue gas that is mostly carbon dioxide and water and so easier to capture.

Post-combustion is the most widely applicable to existing industrial sites because it treats the flue gas without redesigning the process.

The energy penalty

The catch with carbon capture is that it consumes energy. Solvent-based post-combustion capture needs heat to release the captured carbon dioxide from the solvent and electricity to run the plant, and this extra energy demand is significant. The practical consequence is that a site fitting capture needs more energy to produce the same output, which raises both cost and — unless that energy is itself low-carbon — emissions elsewhere.

This is exactly why capture sits last in the hierarchy. Cutting the carbon to be captured through efficiency and fuel switching makes the capture plant smaller and its energy penalty proportionally less burdensome. Capture works best as the final step on an already efficient, partly decarbonised site.

Transport, storage and use

Capturing carbon dioxide is only half the task; it then has to go somewhere. The captured gas is compressed and transported — typically by pipeline — to a permanent store, usually deep geological formations, or to a use that locks it away or substitutes for fossil carbon. Storage requires suitable geology and long-term monitoring; use requires a genuine market for the carbon dioxide.

For most individual sites, transport and storage are shared regional infrastructure rather than something built per factory. The availability of that infrastructure often determines whether capture is feasible at a given location at all, which is why capture projects are usually planned around industrial clusters near storage.

How to assess capture for a site

A structured assessment keeps the decision realistic:

• Split the site's emissions into energy-related and process-inherent — capture matters most where emissions cannot be electrified or fuel-switched away.
• Exhaust the cheaper steps first: efficiency, heat recovery and fuel switching reduce the carbon left to capture.
• Estimate the energy penalty and where the extra energy will come from.
• Check the availability of transport and storage infrastructure for the location.
• Compare the whole-life cost and carbon against the alternatives for the residual emissions.

For the right emissions — especially process emissions with nearby storage — capture is a vital tool. For everything else, the cheaper steps in the hierarchy usually come first.

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