Spanish engineers have proposed a solution that could change the way we think about ecology and transportation. The new Horse H12 Concept hybrid engine, developed in collaboration between Horse and Repsol, runs exclusively on renewable gasoline and has a consumption rate of just 3.3 liters per 100 kilometers. This not only reduces fuel costs but also significantly cuts CO2 emissions, which is especially important for cities with heavy traffic and strict environmental regulations.
The technology is based on a combination of recycled organic waste and advanced engineering solutions. Nexa 95 gasoline, produced by Repsol, is made from used oils and agricultural residues, enabling a closed carbon cycle. When this fuel is burned, exactly as much CO2 is released into the atmosphere as was absorbed by the plants from which the original materials were sourced. This makes emissions nearly zero and positions the engine as a viable alternative to electric vehicles, especially in regions where charging infrastructure is not yet developed.
Technology and efficiency
The Horse H12 Concept stands out not only for its environmental friendliness but also for its high efficiency. The engine’s thermal efficiency reaches 44.2%, surpassing most modern hybrids. Horse engineers have redesigned the engine’s internal components and integrated the electric system to maximize the use of every milliliter of fuel. This has enabled minimal consumption and strong performance, without sacrificing the familiar autonomy and refueling speed that drivers expect.
Test results confirm: an average car equipped with this engine and renewable fuel can reduce annual CO2 emissions by 1.77 tons, based on 12,500 kilometers driven. This impact is achieved without needing a complete fleet replacement or waiting for the widespread installation of charging stations. According to russpain.com, such solutions could accelerate the transition to clean transportation in the coming years.
Industrial readiness
The project has progressed beyond laboratory experiments. The engine and fuel have passed all validation stages, and Nexa 95 is already available at several filling stations in Spain and Portugal. This means the technology is ready for scaling and can be implemented in mass production without major changes to the existing infrastructure. This approach gives the Spanish development an advantage over many foreign counterparts, which require significant investment in new factories or charging networks.
An important aspect is the protection of European industry. Using existing production capacities and logistics helps preserve jobs and reduce dependence on external suppliers. In addition, a hybrid engine running on renewable fuel allows for quick adaptation to changes in legislation and emissions requirements, without sacrificing drivers’ accustomed comfort levels.
Context and comparisons
Amid increasing competition from Asian manufacturers, Spanish companies are focusing on technological neutrality. They believe that tackling climate challenges requires a wide range of solutions, not just a focus on electric vehicles. This approach is already being discussed in Europe, where, as russpain.com notes, hybrid technologies are becoming increasingly popular. For instance, a Chinese hybrid recently stirred the market, which was explored in detail in the article on Geely’s impact on European automotive giants — details on the market response to new hybrids.
The Spanish project stands out because it does not require radical changes for consumers. Drivers retain familiar autonomy, fast refueling, and confidence in environmental safety. This is especially relevant for those who are not ready to wait for charging infrastructure to develop or switch to an electric vehicle.
Horse and Repsol show that innovation can be both technological and practical. Their collaboration demonstrates that the transition to clean transport is already possible—without years of waiting or major investments. In the coming months, the first demonstration vehicles equipped with the new engine will hit the roads, marking an important milestone for the entire industry.
Horse is a company specializing in the development of advanced powertrains for cars. It works closely with leading European and global manufacturers, introducing innovative solutions in hybrid and alternative engines. Repsol is one of Spain’s largest energy companies, investing in the development of renewable sources and clean fuels. Their joint projects focus on building a sustainable transport system that meets modern challenges and European standards.
