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Start with the CO₂ source, not the technology name. Capturing CO₂ from ambient air, a dilute power-plant or cement flue gas, and a concentrated industrial process stream are different jobs, so their cost and energy figures are not directly interchangeable. For a fair comparison, define the source and system boundary, report heat separately from electricity, state the capture rate against a named source stream, and attach every cost to its year, currency, facility, and scope.
What makes two carbon capture options comparable?
A comparison is useful only when it describes the same service under sufficiently similar assumptions. A solvent system on a power-station flue gas and a direct air capture (DAC) plant both capture CO₂, but they process sources with very different concentrations. Their costs answer different questions and should not be ranked as if they were interchangeable bids.
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Before comparing options, record the source, the capture-system boundary, the operating basis, and the cost measure. Include whether the estimate covers only capture or also integration, compression, transport, storage, or use. These choices can change what a figure means.
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Classify the source as ambient air, cement flue gas, coal- or gas-fired power-plant flue gas, or a relatively concentrated process stream. Record the CO₂ concentration where it is available. The International Energy Agency (IEA) explains that dilute sources are harder to separate CO₂ from, affecting energy needs and cost; ambient air is more dilute still than power-station flue gas or cement emissions.
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Name the technology and evidence stage
Identify the process family—such as solvent, membrane, sorbent, chemical looping, or a DAC approach—and say whether the evidence is from a demonstration, a front-end engineering design (FEED) study, or commercial operation. A design study is not the same kind of evidence as an operating plant, and a technology label alone does not establish comparable performance.
Set a common boundary and operating basis
State which equipment and processes are included, the plant capacity and utilization assumptions, and whether the comparison is for a retrofit or a new facility. Note flue-gas pretreatment, utilities, compression, and the connection to transport or storage/use. A capture-only cost is not the cost of the full carbon capture, utilization, and storage (CCUS) chain.
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How should energy use be compared?
Report thermal energy and electricity separately whenever the source provides them. Heat may be needed to regenerate a solvent or sorbent; electricity can serve compression and capture-system auxiliaries. A single combined energy figure can hide whether one option depends more on heat or power, and a figure that omits compression or integration may not cover the same system as another estimate.
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For each estimate, note the energy boundary: what capture equipment and auxiliaries are included, and whether compression is counted. Also record the energy-price assumptions when available, because those assumptions affect cost even if the physical energy demand is unchanged. The U.S. Department of Energy (DOE) identifies thermal requirements, compression electricity, materials, maintenance, equipment size, and retrofit integration among capture-system cost drivers.
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What does a capture rate mean?
Capture rate should be stated as the fraction of CO₂ in a defined source stream that the capture system captures, along with the design or operating basis and measurement period. It does not automatically mean the fraction of a facility’s total greenhouse-gas emissions captured, nor does it describe net lifecycle emissions. Always name the denominator.
Higher capture rates can require larger equipment or additional process steps, which may increase energy per tonne captured and cost. The size of that trade-off depends on the technology and application. DOE’s point-source program describes a focus on capturing at least 95% of point-source CO₂ emissions; that program goal is not a universal result or a directly comparable operating rate for every technology.
Which published costs can be compared?
Published costs are useful as scoped reference points, not universal quotations. The figures below come from different source types and studies. Their boundaries and assumptions differ, so they should not be treated as a ranked technology comparison without reconciling those differences.
| Source or case | Reported cost | Attribution and qualification |
|---|---|---|
| Relatively pure or concentrated industrial streams | USD 15–25 per tonne of CO₂ | IEA, 2021; indicative range based on cited methodology, with energy-price variation and technological uncertainty. Not a current quote. |
| Dilute streams, including cement and power generation | USD 40–120 per tonne of CO₂ | IEA, 2021; indicative range based on cited methodology, with energy-price variation and technological uncertainty. Not a current quote. |
| Large-scale direct air capture plant built today | USD 125–335 per tonne of CO₂ | IEA, 2022; wide-ranging, uncertain estimate sensitive to technology, heat and electricity costs, plant configuration, and financing assumptions. |
| Power-plant FEED case at Milton R. Young Station | $80.60 per tonne of CO₂ captured | NETL, 2024 compendium; a specific case using unscaled 2021-dollar inputs and stated plant and economic assumptions, not a market-wide average. |
These numbers describe different source classes and a specific engineering case, not four bids built to one common basis. The IEA’s point-source ranges are indicative estimates from 2021, the DAC range is an uncertain 2022 estimate, and the NETL figure is tied to one FEED case. Compare them only after checking source, price year, currency, plant assumptions, utilization, energy prices, financing, and system boundary.
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Check the cost measure
Confirm whether a source reports cost per tonne captured or cost per tonne avoided. They are different measures and should not be combined in one ranking. Also verify whether the number includes capital recovery and whether costs for integration, transport, storage, or use sit outside its boundary.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to build a fair comparison step by step
- Define the job: name the CO₂ source and concentration, and whether it is a point source or ambient air.
- Identify the option and evidence: name the technology family and distinguish a demonstration, FEED design, or commercial operation.
- Fix the boundary: list capture equipment, pretreatment, compression, integration, and any transport/storage/use components included or excluded.
- Record energy by form: capture thermal demand and electricity separately; note compression and auxiliaries and the applicable energy-price assumptions.
- State the rate precisely: give the fraction of CO₂ captured from the defined source stream, plus the design or operating basis and measurement period.
- Normalize cost details: record currency, price year, cost per tonne captured or avoided, capacity, utilization, financing or capital-recovery assumptions, and energy prices.
- Compare only on aligned assumptions: where boundaries or operating conditions differ, keep the figures separate and explain the difference instead of presenting a single winner.
When is a facility-specific study more useful?
For a retrofit decision, generic ranges may be too broad. Existing host-plant conditions, available space and utilities, flue-gas pretreatment, and integration requirements affect the result. NETL provides Carbon Capture Retrofit Studies and database tools for particular electricity-generating units and industrial sources. Its power-unit tool requires facility inputs; industrial retrofit data are based on EPA Greenhouse Gas Reporting Program information. Updates are periodic, so identify the version used when citing a result.
For technology categories and downstream storage or use pathways, DOE/NETL’s point-source program material can help establish what an option covers. For a facility decision, use the relevant study or database result with its own assumptions rather than treating it as a general market benchmark.
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