Brazil launches world-first engine built for ethanol-powered grid electricity

By Kaif Shaikh

Brazil has launched what is being described as the world’s first engine designed to run almost entirely on ethanol for large-scale thermal power generation, a project that could open a new pathway for using one of the country’s most abundant biofuels beyond transportation.

The milestone was marked at the Suape II power plant in Pernambuco, where energy company Suape Energia and Finnish technology firm Wärtsilä have completed the implementation phase of the Ethanol Project and are preparing for operational testing under real-world conditions. The initiative aims to demonstrate whether ethanol can serve as a viable fuel for dispatchable electricity generation while helping reduce emissions from the power sector.

While ethanol has been widely used in cars and trucks for decades, particularly in Brazil, it has rarely been deployed as a primary fuel for utility-scale electricity production. Supporters of the project believe that it could change if the technology proves technically and economically competitive.

Turning sugarcane into electricity

According to Suape Energia and Wärtsilä, the project uses a modified Wärtsilä 32M engine capable of operating on ethanol derived primarily from Brazilian sugarcane. The demonstration will involve thousands of hours of testing over the coming years, providing data on performance, reliability, emissions, and economics.

Brazil is uniquely positioned to test the concept. The country is the world’s largest producer and user of sugarcane ethanol and has spent decades building infrastructure for ethanol production, storage, and transportation. However, most of that fuel has traditionally been consumed in the transportation sector.

“Brazil is a world leader in ethanol production, but its potential use in electricity generation has up to now been overlooked,” Suape Energia technical director José Faustino Cândido said in comments previously released by Wärtsilä.

The project’s developers hope to show that ethanol can provide a source of dispatchable power, electricity that can be generated on demand, at a time when many countries are seeking ways to complement intermittent renewable energy sources such as wind and solar.

Why is ethanol power attracting attention

One of the biggest challenges facing modern power grids is balancing reliability with decarbonization. Solar panels only generate electricity when the sun shines, while wind turbines depend on weather conditions. Battery storage can help bridge some gaps, but long-duration energy storage remains expensive in many markets.

This has led utilities and policymakers to explore low-carbon fuels that can be stored and used whenever electricity demand rises. According to the International Energy Agency’s Net Zero Emissions scenario, global bioenergy generation is expected to expand significantly by 2030 as countries seek additional tools to reduce emissions while maintaining grid reliability. 

Wärtsilä has argued that biofuels such as ethanol could help fill that role because they are transportable, storable, and compatible with existing engine-based power generation technologies.

The company also notes that ethanol offers a potential advantage in countries such as Brazil, where large-scale production infrastructure already exists, and supply chains are well established.

A test case for Brazil’s energy transition

The project now enters its most important phase: proving the technology outside the laboratory. According to Suape Energia, the focus will shift toward validating power generation performance, demonstrating economic viability, and determining whether ethanol can become a practical option for future electricity systems.

Industry participants also see broader implications for Brazil’s sugarcane sector. If ethanol-powered electricity generation becomes commercially viable, it could create an additional market for one of the country’s most important agricultural products while strengthening domestic energy security.

Whether ethanol ultimately becomes a major power-generation fuel remains uncertain. However, the Pernambuco project represents one of the most ambitious attempts yet to move ethanol beyond transportation and into the electricity sector.

This article has been republished from The Interesting Engineering.