In the global transition towards a low-carbon economy, the most powerful solutions may not always be found in new technologies. Some are already growing in India’s fields. Sugarcane is one such solution. What makes this crop particularly significant is not simply the range of products it can generate, but the carbon cycle embedded within its entire value chain. Sugarcane captures atmospheric CO₂ as it grows, converting it into biomass and carbohydrates that can be transformed into sugar, ethanol, renewable electricity, bio-CNG, bio-fertilisers and potentially sustainable aviation fuel. In this cycle, agriculture becomes more than food production - it becomes a source of renewable carbon, energy security and climate action.
One Crop, Multiple Solutions
The versatility begins with the cane itself. Sugarcane juice (syrup) can produce sugar as well as ethanol. Molasses, a co-product of sugar manufacturing, provides another important feedstock for ethanol production. Ethanol is already helping India decarbonise surface mobility. The achievement of the E20 blending milestone represents a major step in this journey. India's Ethanol Blended Petrol programme has resulted in an estimated 952 lakh metric tonnes of CO₂ emission reduction, demonstrating how an agricultural resource can be transformed into a strategic national clean-energy asset.
Importantly, the climate value of ethanol can be measured through its life-cycle carbon footprint. According to a study commissioned by ISMA, Indian sugarcane-based ethanol has a reported life-cycle carbon intensity of approximately 17.21 gCO₂e/MJ, reflecting emissions across the relevant stages of its production and use. This demonstrates the potential of sugarcane ethanol to deliver substantially lower-carbon mobility while making productive use of a domestic, renewable feedstock.
The story does not end with ethanol After juice extraction, bagasse, an agro-industrial biomass, is utilised in sugar mills for combined heat and power generation. It provides the steam and electricity required for sugar processing and, where surplus is available, enables mills to supply renewable electricity to the grid.
Bagasse and other sugarcane biomass can also be converted into pellets for co-firing in thermal power plants, helping reduce the fossil-carbon intensity of existing power infrastructure. An independent Life Cycle Assessment by Wageningen Food & Biobased Research, mentions life-cycle carbon intensity of bagasse pellet combustion is as low as 2.176 gCO₂e/MJ under the assessed pathway.
The Carbon That Comes Back
The most important environmental distinction lies in the nature of the carbon.
When ethanol or bagasse is combusted, it releases CO₂. But this is biogenic CO₂. The carbon was recently captured from the atmosphere by the growing sugarcane crop. It is therefore part of the short biological carbon cycle: atmospheric CO₂ is captured by the crop, converted into biomass, utilised as fuel and released again, where it can be recaptured by the next crop.
Fossil Fuels Operate Fundamentally Differently
Coal, oil and natural gas release carbon that has remained locked away for millions of years. Burning them transfers this geological carbon into the atmosphere. This represents a net addition of fossil carbon to the atmospheric system, at a scale and speed that natural carbon sinks cannot fully absorb, particularly as forests and other natural carbon sinks continue to face pressure.
This distinction is central to understanding the climate value of bioenergy. This framework is particularly important where bioenergy is combined with carbon capture and storage (BECCS). The objective is not to claim that biomass combustion produces no CO₂. It is to recognise that renewable biomass recycles contemporary atmospheric carbon, whereas fossil fuels introduce previously stored geological carbon into the atmosphere.
This approach is particularly relevant to the development of carbon-neutrality frameworks and carbon markets. It allows the climate performance of bioenergy to be evaluated on a net lifecycle basis, taking into account cultivation, land-use change, processing, transport, conversion efficiency, methane and other non-CO₂ emissions, carbon-stock changes and, where applicable, carbon capture and storage.
From Sugar Mill To Biorefinery
The modern sugar mill is rapidly evolving into an integrated biorefinery, where even process streams traditionally considered by-products or residues can be converted into valuable resources.
- The CO₂ generated during ethanol fermentation can be captured and utilised, rather than simply released into the atmosphere. Studies from Brazil’s sugarcane ethanol industry have demonstrated that fermentation CO₂ can be recovered and purified to up to 99.90% purity and utilised in applications such as dry ice production and beverage carbonation, creating an additional value stream from carbon originally captured by the sugarcane crop.
- Similarly, spent wash and press mud can support CBG production, converting organic streams into renewable gas while reducing waste. Sugar-industry streams can also generate value-added products such as potash derived from molasses (PDM), returning nutrients to agriculture.
- And the opportunity extends to aviation. Sugarcane-derived ethanol can serve as a feedstock for Alcohol-to-Jet (ATJ) sustainable aviation fuel. Life-cycle assessment of sugarcane-based pathways has reported a carbon intensity of approximately 21.2 gCO₂e/MJ for sugarcane-based SAF, below the international benchmark of 24.1 gCO₂e/MJ. This highlights the potential of Indian sugarcane to contribute to the decarbonisation of one of the world's hardest-to-abate sectors.
More Than Sugar: A Renewable Carbon Economy
The real strength of sugarcane lies in the fact that almost every component of the crop can create value. The principle is straightforward: what can be measured can be compared; what can be verified can be certified; and, where a regulatory framework recognises that environmental attribute, what is certified can acquire economic value.
As global measurement Brazil's RenovaBio provides a relevant example of linking life-cycle carbon performance with market value: biofuel producers are certified based on their carbon intensity, which determines the number of CBIO decarbonisation credits eligible for issuance and trading. The European Union complements this approach through its Union Database, which tracks renewable and recycled-carbon fuels and their raw materials, recording sustainability and greenhouse-gas information across transactions to strengthen traceability and prevent double counting
India has its own Carbon Credit Trading Scheme (CCTS), providing for both offset and compliance mechanism. The architecture is already moving towards implementation. As of July 2026, the approved methodologies include areas such as renewable electricity generation, hydrogen production, industrial energy efficiency and fuel switching, methane recovery and afforestation/reforestation; a dedicated sugarcane-ethanol carbon-intensity methodology is not presently among the listed methodologies. A dedicated sugarcane ethanol carbon intensity methodology is not presently among listed methodology. The more immediate opportunity is to build the measurement, verification and traceability architecture that can allow such pathways to be recognised. A dedicated sugarcane-ethanol carbon-intensity methodology is not presently among the listed methodologies. International carbon markets, including the UNFCCC CDM framework under ACM0017 – Production of Biofuel, provide a reference for accounting for emission reductions from biofuel production and fossil fuel displacement. India should consider introducing a dedicated biofuel-production methodology under CCTS.
For the sugar industry, this has a direct practical implication. A tonne of cane may generate several products and environmental attributes. Juice and syrup can produce sugar and ethanol. Molasses can produce ethanol. Ethanol can decarbonise road transport and become a feedstock for SAF. Fermentation CO₂ can be captured for dry ice and carbonated drinks. Bagasse can generate renewable heat and power. Surplus biomass can become pellets for co-firing. Press mud and spent wash can support CBG production. Molasses-derived streams can produce bio-fertilisers.
This is more than diversification. It is the emergence of a circular carbon economy built around a renewable agricultural resource. And therefore, the objective would not be to create a carbon credit for every tonne of cane or every product manufactured from it. It would be to ensure that the verified carbon performance of an integrated sugarcane biorefinery is measurable, transparent and capable of being recognised by the markets and regulatory systems that increasingly place a value on lower-carbon production.
For India, sugarcane represents a rare convergence of climate action, energy security, farmer-linked value creation and industrial innovation. It is to extract more value from every tonne of cane, recover more energy from every fibre, convert more residues into resources and keep more carbon circulating within the biological economy.
Sugarcane is not just a crop. It is a renewable carbon engine — powering food, fuel, energy and India's transition to a lower-carbon future.
(Writer is Director General, Indian Sugar & Bio-energy Manufacturers Association – ISMA)