Corn ethanol could reach 45% of Brazil's ethanol output within ten years, says Unem

Ethanol made from corn could represent about 45% of Brazil's total ethanol output within the next ten years, according to projections presented by the president of Unem, the industry association representing Brazilian corn ethanol producers, in statements reported by Canal Rural.

The number is a sector projection rather than an official government forecast. Unem links it to three developments it expects to run in parallel: continued growth in installed corn ethanol capacity, an increase in the mandatory ethanol blend in gasoline, and a widening market for the co-products that come out of a corn ethanol plant.

A projection built on capacity growth

The first pillar of the forecast is production itself. Canal Rural reported that Unem's president pointed to the advance of corn ethanol output as the main driver behind the projected share, implying a sustained build-out of plants rather than a one-off addition of volume.

For investors and lenders, the distinction between the two Brazilian ethanol models matters. Sugarcane units are tied to a cane harvest window and to the sugar-versus-ethanol allocation decision. Corn plants run on stored grain and can therefore operate through the year, which changes both the capital profile of a project and the way its feedstock risk is managed.

The blend mandate as demand anchor

The second pillar is the share of ethanol blended into gasoline. According to Canal Rural, Unem expects the increase in that blend to support demand growth for the fuel.

The mechanism is direct: a higher mandated blend lifts anhydrous ethanol volumes automatically, without depending on what drivers choose at the pump between hydrous ethanol and gasoline. The same move reduces the gasoline fraction in every litre sold, which is why blend decisions are watched as closely by fuel importers and refiners as by ethanol producers.

Co-products widen the revenue base

The third pillar cited by Unem is the expansion of the co-product market. A corn ethanol plant does not sell fuel alone, and revenue from the remaining output streams lowers the effective production cost of each litre of ethanol.

• Distillers grains (DDG and DDGS), a protein feed that competes with soybean meal and corn in poultry, pork and cattle rations.
• Corn oil, used as a biodiesel feedstock and in industrial applications.
• Food-grade carbon dioxide, captured at some plants and sold into the beverage and food processing industries.

The commercial consequence is that corn ethanol margins are no longer set by fuel prices alone. They also move with animal protein demand, with soybean meal values and with the biodiesel feedstock market, which spreads risk but also ties the sector to several price cycles at once.

What the market will be watching

The projection carries direct implications for grain flows. Brazil is one of the world's largest corn exporters, and every tonne processed domestically into ethanol and feed is a tonne that does not reach the export market. If the share Unem describes materialises, buyers in Asia, North Africa and the Middle East would face a larger and more permanent domestic bid for Brazilian corn, particularly for the second-crop harvest that supplies most of the exportable surplus.

Three variables will determine whether the 45% figure holds. Regulatory decisions on the gasoline blend set the ceiling on domestic demand. The spread between corn purchase costs and ethanol plus co-product revenue determines whether new plants are financeable. And the pace at which capacity is actually commissioned will show whether the association's ten-year horizon reflects projects already in motion or an ambition that still depends on capital being committed.