Nexa fuels from 100% renewable sources

In practical terms for the driver, a renewable source fuel is a fuel equal to conventional ones. The difference is that they are produced from raw materials of renewable origin, which are given a second life and reduce CO₂ emissions. It is the same solution as the electric vehicle in terms of CO₂ emissions.

No, as long as you use the right product for your vehicle: 

• Nexa diesel of 100% renewable origin: compatible with diesel combustion engines, without the need to make any modifications.
• Nexa 95 Gasoline of 100% renewable origin: Repsol declares it compatible with gasoline and hybrid vehicles, without the need to modify the engine.

Yes. Renewable fuels are fully compatible with fossil fuels, so you can use renewable or conventional fuel in the same vehicle, depending on your choice in each refueling. It is not necessary to make any modifications to the engine or follow a specific procedure to change from one fuel to another.

No. The DGT environmental label is assigned according to the characteristics and type approval of the vehicle, not according to the fuel that is used at a specific time. Therefore, using renewable fuel does not modify the badge or guarantee access to a Low Emission Zone. Before traveling, check the city regulations and the conditions applicable to your vehicle.

However, it should be noted that modern internal combustion engines feature very low certified emission levels, compatible with the air quality improvements targeted by Low Emission Zones (LEZs).

The Nexa range of 100% renewable origin is our highest quality fuel. The exclusive formulation of these fuels incorporates components developed by Repsol to optimize performance and help keep feed and injection systems clean. In the case of Nexa Diesel of 100% renewable origin, it stands out for its absence of aromatic compounds, a high cetane rating, anti-corrosion additives and systems to separate the water from the fuel. Helping to maintain the engine's brand-new performance.

The hybrid prototype developed by Horse Powertrain and Repsol achieved a peak thermal efficiency of 44.2% and fuel consumption of less than 3.3 l/100 km in the WLTP test cycle. The 40% reduction is compared to the average for new petrol passenger cars registered in Europe in 2023. Powered by 100% renewable Nexa 95 Gasoline, it achieves net-zero operational emissions, with a footprint reduction of over 70%.  

This prototype demonstrates that it is still possible to optimize internal combustion engine propulsion systems, combining efficiency and renewable fuels.

Reduction must be evaluated across the entire lifecycle: renewable raw material sourcing, processing, transport, distribution, and end use. It is not enough to just look at the tailpipe emissions. 

Using this approach, Repsol reports the following net reductions compared to the equivalent fossil fuels they replace:

100% renewable Nexa fuels provide the highest guarantees of quality, reliability and performance. They strictly comply with national and international quality specifications and hold the necessary approvals and certifications to ensure safe, vehicle-compatible use. In addition, we hold European ISCC-EU certification and apply verification systems to ensure product traceability from raw maetrial origin to the pump, in complaince with the European RED Directive.  

Likewise, its quality and technical compatibility are supported by international reference standards, such as those promoted by the Worldwide Fuel Charter, which establishes global recommendations for safe, reliable and suitable fuels for today's engines.

The circular economy also plays a key logistical role: we have set up  used cooking oil collection points at more than 750 service stations across several autonomous communities.

In this way, members of the public actively participate by contributing their own waste, which we then give a second useful life by transforming it into energy resources for transport.

Additionally, to ensure final quality and prevent fraudulent practices, we add an exclusive marker to the product that unequivocally identifies its origin.

Renewable fuels and electrification meet different needs and can complement each other. Electricity is particularly efficient for short trips, while renewable liquid fuels can reduce the carbon footprint and offer a solution tailored to each customer's needs, from road mobility to hard-to-electrify sectors such as maritime and air transport. 

The choice of technology depends on individual use and needs, as well as energy efficiency, infrastructure availability, vehicle type, distance, cost, and lifecycle emissions.

Over 97% of the European vehicle fleet currently consist of internal combustion engine vehicles. The Spanish fleet is aging: the average age of passenger cars reached 14.6 years in 2025, and 9.28 million vehicles were over 20 years old, according to ANFAC data from the DGT. Renewable fuels allow us to address part of that existing fleet without waiting to replace all vehicles

This benefit does not replace the need to fleet renewal, but rather helps accelerate it by incorporating all available solutions. At Repsol, we are committed to a more modern, efficient fleet with a lower carbon footprint, where electrification and renewable fuels advance as equally valid alternatives depending on the vehicle, use and available infrastructure.

Larger-scale deployment depends on the sustainable availability of raw materials, industrial capacity, costs, traceability, and stable regulations. The use of renewable raw materials must comply with sustainability, traceability and emissions reduction criteria under the European renewable energy framework, avoiding indirect impacts or competition with other priority uses. 

We need a stable, long-term, and consistent regulatory framework across all sectors that puts renewable fuels on equal footing with electricity, under a technology-neutral approach. It is the only way to reach the target, enable further industrial investment, and address the remaining challenges of both renewable fuels and electrification. 

In the European Union, current regulations for new passenger cars and vans maintain a target of 100% reduction in CO₂ emissions for the new vehicle fleet by 2035. This regulation is under review.

The Directive that would prohibit the sale of light-duty vehicles with combustion engines is currently under review (expected by the end of the year). The publications at the end of 2025 already signalled an opening and included renewable fuels as part of the solution. Debates are currently ongoing as to how all solutions can be included under a technology-neutral approach.