India has expanded its ethanol blending programme at a pace few anticipated five years ago, pushing past interim targets and signalling intent to move further still. The biotechnology underpinning this expansion now broadly matches what is deployed in the world's most advanced markets. Yet on cost, India remains the outlier among the three dominant ethanol producers. Brazil continues to produce the cheapest ethanol in the world. The United States sits in the middle, its costs kept down by heavy automation. India sits at the top of that ladder, and the reasons have less to do with technology than with the structure of its industry.

Brazil's advantage begins with sugarcane. The crop is grown at scale, harvested with established logistics, and processed in integrated mills that convert cane to ethanol with minimal handling losses. The United States has built a comparable advantage around corn, a grain supply that is uniform, abundant, and predictable from season to season. Both systems benefit from decades of consolidation around a single dominant feedstock.

India's experience has followed a different path. Ethanol production here draws on a mixed basket of rice, maize, damaged food grains, and a growing volume of agricultural residue. This diversification was, in part, a necessity born of food security concerns and regional crop variation, but it has come at a cost. Feedstock that varies by state, season, and harvest quality is harder to plan around and more expensive to process consistently than a single, optimised crop.

Scale compounds the problem. Brazilian and American ethanol plants tend to be large, automated, and tightly integrated with their feedstock supply chains. India's production landscape, by contrast, remains fragmented, with a large number of smaller, decentralised plants that lack the throughput to drive down unit costs. This is not simply a matter of plant size. It reflects a different financial logic altogether. Indian producers have generally favoured a low capital expenditure, high operational expenditure model, building plants cheaply and accepting higher running costs over time. Western producers have taken the opposite approach, investing heavily upfront in automation to secure lower operating costs over the life of the plant. Neither model is inherently wrong, but they produce very different cost curves, and India's choice has left it more exposed to the price of labour, energy, and feedstock fluctuation year on year.

Where the gap is narrowing, however, is at the level of biochemical efficiency. In first-generation ethanol production, enzymes account for only 3 to 4 per cent of total conversion costs, but because this segment of the industry already operates at vast scale, even marginal gains of 1 to 2 per cent in yeast or enzyme performance translate into significant savings once applied across national output. Second-generation ethanol, made from agricultural residue rather than food grain, tells a different story. Enzyme costs there run between 20 and 30 per cent of conversion expenses, reflecting the relative immaturity of the technology. India holds an estimated 350 million tonnes of biomass surplus annually, a resource base that gives it room to bring 2G costs down as enzyme technology improves and scales.

What this suggests is that India's challenge has shifted. The country is no longer primarily constrained by capacity, having already proven it can build out blending infrastructure quickly. The task now is one of refinement, narrowing the gap through better plant architecture, more consistent feedstock handling, and continued gains in enzyme efficiency, rather than simply adding more production lines.

It would also be a mistake to judge the economics of advanced biofuels by production cost alone. Second-generation ethanol in particular carries value that does not show up on a balance sheet in the conventional sense, including reduced dependence on imported fuel, measurable improvements in air quality, a productive use for agricultural waste that would otherwise be burned, and progress against long-term emissions commitments. Any complete assessment of India's ethanol economy has to weigh these factors alongside the raw cost per litre.

‍