What would make carbon-to-sugar cost competitive?
Whether sugar made from carbon competes with crop-derived sugar comes down to a few levers: the cost of energy and hydrogen, the cost and concentration of the carbon source, conversion efficiency and productivity, how fully the plant runs, capital cost, and purification. Get them right at a well-chosen site and carbon-derived sugar can reach parity or better; get them wrong and it cannot. Solarferm's figures are modelled projections it is building to demonstrate.
Why cost, not feasibility, is the question
Making sugar from carbon is no longer in doubt scientifically: a cell-free route from CO₂ to starch was demonstrated in Science, and the broader field has shown carbon-to-sugar chemistry and biology work. The open question for a buyer or investor is cost at scale. Recent techno-economic reviews of one-carbon biomanufacturing reach the same conclusion: most routes are technically real but sit at pilot scale, and commercial viability hinges on a handful of cost levers.
The levers that decide it
Energy cost. The conversion is energy-intensive, so the price of energy at the site is one of the largest determinants of unit cost.
Hydrogen cost. Building sugar from carbon needs hydrogen; its price and carbon intensity flow straight through to the product. The IEA flags hydrogen volume and cost as central to every CO₂-utilisation route.
Carbon source cost and concentration. A cheap, concentrated, reliable carbon stream is far easier to work with than a dilute or expensive one.
Conversion efficiency and productivity. How much product per unit of input and per unit of time sets both operating cost and capital intensity.
Plant utilisation. Continuous, high-utilisation operation spreads fixed costs; intermittent running does the opposite.
Capital cost and purification. Reactor and balance-of-plant capex, and the cost of purifying output to fermentation grade, complete the picture.
Where it tips
Carbon-to-sugar reaches parity or better when these line up: a site with abundant or under-utilised carbon and energy, low-cost hydrogen, continuous operation, and output that can be qualified for fermentation. Industry analyses of fermentation scale-up reach a parallel conclusion, that feedstock cost and secured offtake are decisive for financing and for the economics of new capacity.
The chemistry and biology of carbon-to-sugar are demonstrated; feasibility is not the open question.
Cost-parity figures, including Solarferm's modelled roughly 20% lower cost than conventional dextrose, depend on site-specific energy, hydrogen, and carbon costs.
Reaching and holding cost parity at commercial scale, with high utilisation, is what remains to prove.
Where Solarferm fits
Solarferm's public position is that these levers are solvable at well-chosen sites, which is why it states a modelled target of roughly 20% lower cost than conventional crop-derived dextrose and frames it as a projection it is building to demonstrate rather than a measured result. The specific route is not disclosed.
Frequently asked questions
What makes carbon-to-sugar expensive today?
Mainly the cost of energy and hydrogen, the cost of the carbon source, and the capital and utilisation of early-stage plants. The IEA notes CO₂-utilisation routes are energy- and hydrogen-intensive and currently cost more than fossil-based equivalents in most regions.
What would bring the cost down?
Cheap, abundant energy and hydrogen, a concentrated low-cost carbon stream, high conversion efficiency, continuous high-utilisation operation, lower capital cost, and efficient purification to fermentation grade.
Does carbon-to-sugar already compete with crop sugar?
Not yet broadly. The science is demonstrated but most routes are at pilot scale; competitiveness depends on site-specific costs. Solarferm's roughly 20% lower-cost figure is modelled, not measured.
What role does plant utilisation play?
A large one. Continuous, high-utilisation operation spreads fixed and capital costs across more output, which is central to reaching parity.
Is the cost claim proven?
No. Solarferm frames its cost figure as a modelled projection against conventional crop-derived dextrose that it is building to demonstrate.
References
- Cai T, Sun H, Qiao J, et al. Cell-free chemoenzymatic starch synthesis from carbon dioxide. Science. 2021;373(6562):1523–1527. doi:10.1126/science.abh4049
- International Energy Agency. Putting CO2 to Use. IEA, Paris. 2019. https://www.iea.org/reports/putting-co2-to-use Accessed 14 June 2026.
- Zhang C, Fei Q, Fu R, Lackner M, Zhou YJ, Tan T. Economic and sustainable revolution to facilitate one-carbon biomanufacturing. Nature Communications. 2025;16. doi:10.1038/s41467-025-60247-w
- Good Food Institute. Driving down costs of fermentation-derived ingredients: a meta-analysis of techno-economic models. Good Food Institute, Washington, DC. 2025. doi:10.62468/trxj5734
- McKinsey & Company. Ingredients for the future: bringing the biotech revolution to food. McKinsey & Company. 2025. https://www.mckinsey.com/industries/agriculture/our-insights/ingredients-for-the-future-bringing-the-biotech-revolution-to-food Accessed 14 June 2026.