Advanced biofuels have burst onto the energy scene as a crucial alternative for reducing the carbon footprint of transportation without requiring modifications to existing infrastructure or vehicles. These fuels, produced from non-food organic waste—such as pruning waste, forestry debris, used oils, or even algae—have the advantage of not interfering with the human food chain or exacerbating land-use change, two recurring criticisms of conventional biofuels.
The energy transition has become a multidimensional process that, according to experts and organizations such as the Repsol Foundation and the Carlos III University of Madrid, will only be possible if various technological solutions are used, including the widespread adoption of renewable fuels. These fuels can be rapidly integrated into the current energy and mobility system, utilizing existing logistical infrastructure, from service stations to pipelines, without requiring additional investment or time for industrial adaptations.
One of the major advantages of advanced biofuels lies in their versatility and immediate decarbonization capabilities . They can be used without modification in existing combustion engines, in the automotive, maritime, and aerospace sectors, thus facilitating a significant reduction in emissions. Furthermore, their production promotes a circular economy by valorizing organic waste and preventing its accumulation or incineration, thereby boosting the local economy and the reindustrialization of rural or declining areas.
The technological routes for obtaining these fuels are diverse: from the hydrotreating of used oils, employed in products such as renewable diesel, to fermentation for generating bioethanol, anaerobic digestion (which produces biogas and biomethane), pyrolysis, and gasification of lignocellulosic biomass. Each process maximizes the transformation of available waste into clean, high-value-added energy.
Spain is positioning itself as one of the leading countries in advanced biofuels due to a combination of differentiating factors. These include the abundance of agricultural and forestry waste, its industrial base, and a network of refineries ready for conversion into multi-energy centers. Investments in R&D and the acquisition of European funding reinforce Spain's position as a European benchmark in bioeconomy and biocircularity.
European momentum and pioneering mobility projects
The European Union recognizes the strategic role of these fuels, and its RED III directive requires that by 2030 at least 5,5% of fuels used in transportation be advanced biofuels or non-biological renewables. Experiences such as the Tour de Europe, where vehicles traveled thousands of kilometers using a majority renewable fuel mix, have demonstrated that the technology is already available and economically viable, without affecting logistics or vehicle operations.
At the national level, the National Integrated Energy and Climate Plan sets an even more ambitious goal: achieving 28% renewable energy in transportation by 2030. The Ministry for Ecological Transition, in turn, has implemented regulatory and fiscal measures to limit the use of food crops and prioritize waste in biofuel production, strengthening environmental sustainability and promoting innovative energy uses such as biomethane.
The push for these fuels is also accompanied by significant regulatory and fiscal updates . Some governments have increased the minimum purchase prices for biofuels such as biodiesel and bioethanol, adjusting the amounts to maintain competitiveness and reflect production costs. Furthermore, strict payment deadlines have been established for these products, and sectors such as transportation are debating the impact on final costs for consumers and businesses.
Actions on the ground are not limited to land transport. Companies like Armas Trasmediterránea have begun using advanced 2G biofuels on maritime routes, especially in the Canary Islands, as part of plans aimed at reducing emissions and improving fleet efficiency. These initiatives align with strategic alliances with specialized companies and demonstrate a commitment to European guidelines on port and maritime sustainability.
Circular economy, innovation and technological development
One of the distinguishing features of advanced biofuels lies in their contribution to the circular economy. Transforming agricultural, forestry, urban, or even animal fat waste into energy reduces the impacts of waste management and, at the same time, strengthens the local economy by creating new value chains related to logistics, processing, and distribution.
Energy companies, such as Repsol, have committed to developing large renewable fuel production plants, like the recently inaugurated one in Cartagena and the future one in Puertollano, where they process all types of waste. This flexible approach, which combines lipid, biological, thermochemical, and e-fuel technologies, aims to maximize energy efficiency and promote circularity, a key aspect for the reindustrialization of territories in transition.
At the same time, research and innovation play a fundamental role. Technology platforms and universities are working closely to secure European funding and promote pilot projects that will scale production and, in the long term, integrate biofuels into the main sectors of the national economy. Experts agree that, although electrification will be essential for urban uses, biofuels are essential for decarbonizing sectors such as heavy transport, aviation, and maritime.
Another relevant aspect is the economic impact of these fuels. According to some estimates, with the intensive use of domestic raw materials such as agricultural and forestry waste, up to 58% of the demand for fossil fuels could be replaced, significantly reducing emissions and contributing to the revitalization of the rural economy.
The development of these fuels is also supported by strict regulations requiring sustainability certification and traceability to guarantee their renewable origin, a prerequisite for accessing both subsidies and markets and meeting international standards.
The technological maturity achieved and the availability of the first operational industrial facilities demonstrate that the advanced biofuels sector can offer immediate and scalable solutions. Large transport companies, vehicle manufacturers, and logistics operators have already integrated these fuels into their fleets, with tests confirming emissions reductions and full compatibility with existing equipment.
The energy sector faces significant challenges, such as tax adaptation, the need for investment, and the establishment of clear regulatory frameworks. However, the conditions for widespread adoption in Spain and Europe are favorable; accumulated experience and a commitment to technological diversification consolidate these fuels as a key element in the transition toward low-carbon mobility and industry.
Looking to the future, transportation will not depend solely on electrification, but rather on a combination of options tailored to each sector. For the decarbonization of segments that are difficult to electrify, such as aviation or long-distance road and sea transport, advanced biofuels offer an already available alternative. Their ability to reduce emissions, utilize waste, and revitalize regions positions them as a crucial tool in the energy transition.