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Start with the CO₂ source, not the technology label
The concentration of CO₂ in the gas being treated is a first-order comparison factor. Separating CO₂ from a relatively pure process stream is not equivalent to extracting it from dilute flue gas, and neither is equivalent to direct air capture (DAC), which removes CO₂ from ambient air. A cost or energy figure without its source can make unlike systems appear comparable.
Concentrated industrial streams
Some industrial processes produce relatively pure or concentrated CO₂ streams. The International Energy Agency (IEA) gives an indicative capture-cost range of USD 15–25 per tonne of CO₂ for such streams in its 2021 analysis. This is a source- and assumption-dependent estimate, not a current quotation for every facility.
Dilute point-source emissions
Cement and power-generation flue gases are examples of dilute sources. The IEA’s 2021 indicative range for capturing CO₂ from dilute streams is USD 40–120 per tonne. The range reflects variation in source conditions, energy prices, technology, and other assumptions; it should not be treated as a universal price.
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Direct air capture
DAC addresses ambient air, where CO₂ is more dilute than in power-station flue gas or cement-plant emissions. That makes it a distinct service with its own energy and cost profile, rather than another point-source option in a like-for-like plant comparison. In 2022, the IEA estimated USD 125–335 per tonne of CO₂ for a large-scale DAC plant built today, while noting substantial uncertainty and sensitivity to energy prices, plant configuration, and financing assumptions.
Which dimensions make a comparison fair?
Before ranking technologies, record the conditions under which each figure was produced. If source, boundary, or operating assumptions differ, show the figures as separate cases instead of implying that one technology is inherently cheaper or more efficient.
Source and concentration
Name the source—such as ambient air, cement flue gas, coal- or gas-fired power flue gas, or a concentrated process stream—and report its CO₂ concentration when available. Concentration affects separation difficulty and can change both energy demand and cost.
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Technology and evidence stage
Identify the process family, such as solvent, membrane, sorbent, chemical looping, or a DAC approach. Also state whether the evidence is from a demonstration, a front-end engineering design (FEED) study, or commercial operation. A design study and an operating commercial plant do not provide the same kind of evidence.
Energy use
Report thermal energy and electricity separately wherever the source provides them. Heat may be needed to regenerate a solvent or sorbent; electricity may serve compression and other capture-system equipment. State whether the figure includes compression, auxiliaries, pretreatment, and integration with the host facility. The U.S. Department of Energy (DOE) identifies thermal demand, compression electricity, materials, maintenance, equipment size, and retrofit integration as cost drivers, so a single unqualified energy number can hide important differences.
Capture rate
Define the denominator and basis for the percentage. A capture rate normally means the fraction of CO₂ in a specified source stream that the capture system removes; it does not, by itself, mean the same fraction of the facility’s total greenhouse-gas emissions or lifecycle emissions. State whether the rate is a design target or measured operating result and give the measurement period when known.
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DOE’s point-source program describes a focus on capturing at least 95% of point-source CO₂ emissions. This is a program target, not proof that every technology or installation achieves that rate in operation. The IEA explained in 2019 that pursuing higher capture rates can require larger equipment or additional process steps, potentially increasing energy per tonne captured and cost; the effect varies by technology and application.
Cost and system boundary
For every cost, state the currency, price year, facility or case, and whether the metric is per tonne captured or per tonne avoided. Include relevant assumptions such as plant capacity and utilization, capital recovery, energy prices, and the equipment or process boundary. Cost per tonne captured and cost per tonne avoided are different measures and should not be combined as though they were the same.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCapture-only cost is not the total cost of carbon capture, utilization, and storage (CCUS). Transport, storage or use, and some host-facility integration expenses may fall outside a capture estimate. Check the stated boundary before using a number to compare whole projects.
What published cost figures can—and cannot—tell you
The following figures describe different sources and evidence cases. Their scopes and assumptions are not uniform, so the table is a guide to interpreting them, not a league table.
| Source or case | Reported capture cost | Attribution and qualification |
|---|---|---|
| Relatively pure or concentrated industrial streams | USD 15–25 per tonne of CO₂ | IEA, 2021; indicative, source- and assumption-dependent range. |
| Dilute streams, including cement and power generation | USD 40–120 per tonne of CO₂ | IEA, 2021; indicative range, not a universal current quotation. |
| Large-scale direct air capture plant built today | USD 125–335 per tonne of CO₂ | IEA, 2022; uncertain estimate sensitive to technology, energy costs, configuration, and finance. |
| Milton R. Young Station power-plant FEED case | $80.60 per tonne of CO₂ captured | NETL, 2024 compendium; a specific case using unscaled 2021-dollar inputs and stated economic assumptions, not a market-wide average. |
The case-study figure should not be directly ranked against the IEA ranges without reconciling the source, facility assumptions, utilization, cost year, and system boundary. The IEA ranges likewise describe broad source categories, not a guaranteed cost for an individual plant.
How to compare candidate systems step by step
- Define the job. Specify the source stream, CO₂ concentration if available, location or facility context, and whether the task is point-source capture or DAC.
- Set a common boundary. Decide whether the comparison covers capture equipment alone or also pretreatment, compression, utilities, retrofit work, transport, and storage or use. Mark any excluded items.
- Normalize the operating basis. Record capacity and utilization assumptions, and use the same basis for energy and cost wherever possible. Keep heat and electricity as separate entries.
- Specify capture performance. Record the capture-rate denominator, design or operating basis, and measurement period. Distinguish an intended rate from a demonstrated result.
- Normalize economics. Label currency and price year, and distinguish cost per tonne captured from cost per tonne avoided. Identify capital recovery and energy-price assumptions when available.
- Compare evidence maturity. Label each result as a demonstration, FEED estimate, or commercial operating data. Do not present a projected design case as an observed plant outcome.
- Keep unlike cases separate. If the source, boundary, or assumptions cannot be reconciled, report each case with its caveats rather than forcing a single ranking.
Why capture rate should be read with energy and cost
A percentage alone does not describe the practical performance of a capture system. Raising the fraction removed from the source stream may involve larger equipment or extra process steps. Those changes can affect energy consumed per captured tonne and the resulting cost. Conversely, a high capture rate reported for one boundary cannot be compared fairly with a lower rate measured using a different denominator or operating basis.
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DOE and the National Energy Technology Laboratory (NETL) describe a program focus on at least 95% capture of point-source CO₂ emissions, while the IEA’s 2019 discussion highlights the potential cost and energy consequences of pushing rates higher. These statements describe program priorities and a general design trade-off; neither establishes one universal rate-cost curve for all capture technologies.
When a facility-specific retrofit estimate is needed
Generic ranges are useful for framing the problem, but a retrofit depends on the host unit, available space and utilities, flue-gas conditions, pretreatment, compression, and connection to transport and storage or use. NETL provides Carbon Capture Retrofit Studies and database tools for particular electricity-generating units and industrial sources. Its power-unit tool requires facility inputs, while industrial retrofit data are based on EPA Greenhouse Gas Reporting Program information. Because updates are periodic, identify the version used when citing or relying on an estimate.
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