What is the carbon footprint of carbon monoxide produced via plasma conversion?

The carbon footprint of carbon monoxide produced via plasma conversion depends primarily on the carbon intensity of the electricity used and the origin of the CO₂ feedstock. When powered by renewable electricity and sourced from industrial off-gases, lifecycle assessments indicate plasma-converted CO can achieve a carbon intensity of around 0.7 tonnes of CO₂-equivalent per tonne of CO produced, making it not just low-carbon but carbon-negative overall. That compares to a global average of 2.1 tonnes of CO₂-equivalent per tonne of CO from conventional fossil-based production routes. The sections below unpack how that figure is calculated, what drives it, and what it means for industrial buyers navigating Europe’s carbon regulations.

How is the carbon footprint of carbon monoxide actually calculated?

The carbon footprint of carbon monoxide is calculated using a lifecycle assessment (LCA) methodology that accounts for all greenhouse gas emissions associated with producing one tonne of CO, from feedstock sourcing and energy consumption through to the conversion process itself. The result is expressed in tonnes of CO₂-equivalent (CO₂-eq) per tonne of CO produced, and it captures both direct and indirect emissions across the value chain.

For fossil-derived CO, typically produced via steam methane reforming or partial oxidation of hydrocarbons, the LCA includes the emissions from extracting and processing natural gas, the combustion energy required to drive the reaction, and any process CO₂ released directly. This is why conventional CO production carries a substantial carbon burden: it relies on fossil inputs at every stage.

For plasma-based CO production, the LCA framework shifts significantly. The key variables become:

Electricity carbon intensity: The grid emissions factor of the power source driving the plasma reactor, measured in tonnes of CO₂ per MWh
Feedstock origin: Whether the CO₂ input is biogenic, industrial off-gas, or fossil-derived, each carries a different upstream carbon burden
Energy consumption per tonne of output: The efficiency of the conversion process itself, expressed in kWh per tonne of CO produced
System boundaries: Whether the assessment includes avoided emissions from displacing fossil CO and whether the oxygen co-product is credited

Because plasma conversion recycles CO₂ that has already been emitted, rather than extracting new carbon from the ground, the feedstock itself carries no additional upstream fossil extraction burden. The CO₂ is treated as a circular input rather than a primary resource. This is a fundamental difference in how the LCA is structured compared to fossil-based routes, and it is why the resulting carbon intensity figures can be dramatically lower.

How does plasma-converted CO compare to fossil-derived CO in emissions?

Plasma-converted CO carries significantly lower lifecycle emissions than fossil-derived CO. Conventional fossil-based CO production emits a global average of 2.1 tonnes of CO₂-equivalent per tonne of CO produced (with Europe’s average cited at around 1.2 t CO₂-eq/t CO). By contrast, plasma conversion using renewable electricity and biogenic or industrial CO₂ feedstock achieves approximately 0.7 tonnes of CO₂-equivalent per tonne of CO, a reduction of more than 65% against the European average and over 66% against the global baseline.

The gap exists for three structural reasons. First, fossil-based production routes require hydrocarbon inputs whose extraction and processing are themselves carbon-intensive. Second, the thermal energy needed to drive conventional reactions typically comes from burning gas, adding direct process emissions. Third, the CO₂ released as a byproduct of fossil-based reforming is rarely captured at source.

Plasma conversion inverts this logic entirely. The plasma conversion process uses captured industrial CO₂ as its primary feedstock, carbon that has already been emitted and would otherwise be vented or stored. Renewable electricity drives the reaction. No combustion occurs inside the reactor, so there are no direct process emissions. The only remaining carbon intensity comes from the upstream electricity supply, which is why grid carbon intensity is the single most important variable in the comparison.

It is also worth noting that plasma conversion produces no carbon black as a byproduct, a common concern with some alternative CO₂ utilization pathways. The output is high-purity CO, directly usable as a chemical feedstock without further processing steps that would add their own emissions burden.

What role does the electricity source play in plasma CO2 conversion emissions?

The electricity source is the dominant factor in determining the carbon footprint of plasma CO₂ conversion. Because the plasma reactor is fully electrified, with no combustion or fossil thermal input, virtually all of the process’s remaining greenhouse gas emissions come from the power grid supplying the reactor. The cleaner the electricity, the lower the carbon intensity of the CO produced.

Lifecycle data indicates that the plasma conversion process remains carbon-negative as long as the electricity grid it draws from emits below approximately 0.4 tonnes of CO₂ per MWh, a threshold comparable to a low-carbon national grid average, and one that a growing number of European grids already meet or exceed. Below that threshold, the carbon removed from the atmosphere by recycling CO₂ outweighs the emissions generated by the electricity consumed.

The energy efficiency of the process amplifies this advantage. D-CRBN’s electrified CO production platform operates at approximately 1,100 kWh per tonne of CO₂ processed, roughly five times more efficient than competing conversion routes such as the reverse water-gas shift reaction. A more efficient process consumes less electricity per tonne of output, which directly reduces the electricity-related carbon burden regardless of the grid mix.

There is an additional operational dimension worth noting. Because plasma reactors can start and stop rapidly, they can be scheduled to run during periods of surplus renewable generation, when wind or solar output exceeds demand and grid electricity is both cheapest and cleanest. This flexibility means the effective carbon intensity of the electricity consumed can be lower than the grid average, further improving the lifecycle carbon profile of the CO produced. AI-assisted energy scheduling can optimize this in real time, allowing the reactor to function as a form of renewable energy storage embedded in the industrial process.

Does CO2 recycling via plasma count as carbon-neutral or carbon-negative?

CO₂ recycling via plasma can be classified as carbon-negative when powered by renewable electricity and using biogenic or industrial off-gas CO₂ as feedstock. A lifecycle assessment of D-CRBN’s plasma process yields approximately 0.7 tonnes of CO₂-equivalent per tonne of CO produced, which, when set against the CO₂ consumed as feedstock and the fossil CO it displaces, results in a net removal of CO₂ from the atmosphere rather than a net addition.

The distinction between carbon-neutral and carbon-negative matters for regulatory and commercial purposes. Carbon-neutral means emissions in, equal emissions out, a balance of zero. Carbon-negative means the process removes more CO₂ from the atmosphere than it emits across its full lifecycle. Plasma CO₂ conversion achieves the latter when the electricity grid is sufficiently clean, because the CO₂ feedstock is treated as a circular input whose carbon content is not newly extracted from geological reserves.

The mechanism works as follows: industrial CO₂ that would otherwise be emitted is captured at source and fed into the plasma reactor. The reactor breaks the CO₂ molecule and outputs carbon monoxide, which re-enters the industrial value chain as a feedstock for chemicals, fuels, or steelmaking. The carbon is not stored underground, it is actively utilized, displacing fossil-derived CO and reducing the overall demand for virgin fossil carbon inputs. This is the essence of Carbon Capture and Utilization (CCU) as distinct from Carbon Capture and Storage (CCS).

D-CRBN’s stated trajectory reflects this carbon-negative potential at scale. By 2035, the company targets cumulative CO production of 5.5 million tonnes, which it calculates corresponds to 3.8 million tonnes of CO₂ actively removed from the atmosphere. Whether a specific deployment achieves carbon-negative status depends on the grid carbon intensity at that site, but the pathway to carbon negativity is technically achievable with today’s renewable energy infrastructure in many European markets.

How does plasma-produced CO affect a buyer’s ETS carbon costs?

Switching from fossil-derived CO to plasma-produced CO directly reduces a buyer’s CO₂ emissions under the EU Emissions Trading System (ETS), which translates into a lower obligation to purchase carbon allowances. Since each tonne of CO₂-equivalent avoided reduces the number of ETS allowances a facility must surrender, the carbon intensity gap between fossil CO and plasma CO, which can exceed 1.4 tonnes of CO₂-eq per tonne of CO in European comparisons, creates a measurable and quantifiable cost reduction per tonne of CO consumed.

The financial impact scales with both the volume of CO consumed and the prevailing ETS carbon price. As European carbon prices have trended upward over recent years and are expected to continue rising as free allocation phases out under the ETS reform schedule, the economic advantage of sourcing lower-carbon feedstocks compounds over time. Facilities that lock in lower-carbon CO supply today are effectively hedging against future carbon price exposure.

There is a secondary ETS benefit as well. When plasma-converted CO is used as a reducing agent in steelmaking, replacing coke or coal-derived reductants, the emissions reduction occurs at the point of use, not just at the point of production. This means the buyer captures ETS savings across both the feedstock supply chain and the direct process emissions associated with their own operations.

For procurement and sustainability teams evaluating electrified feedstock options, the ETS cost reduction should be modeled alongside the feedstock price itself. In markets where carbon allowances are priced at levels that make low-carbon alternatives cost-competitive with fossil inputs on a total cost basis, plasma-produced CO is no longer a sustainability premium, it is the economically rational choice. This is precisely the market positioning that makes plasma CO₂ conversion commercially viable without relying on green premiums that the current industrial procurement environment is increasingly unwilling to pay.

For industrial operators ready to quantify these savings for their specific site and production volumes, D-CRBN’s team can provide a tailored benchmark comparing plasma-produced CO against current fossil feedstock costs and projected ETS obligations. Reach out to D-CRBN’s experts to model the carbon cost impact for your facility.

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