The first Injection of biomethane obtained from industrial waste in Spain It's now a reality, and it's been completed in Andalusia. The facility, located at the Gunvor complex in Palos de la Frontera (Huelva) and developed by Veolia, marks a turning point in the way certain liquid industrial effluents are managed, transforming them from an environmental problem into a usable energy resource.
With this project, the two companies demonstrate that the circular economy and energy recovery They can be effectively applied in a real industrial setting, supplying renewable gas to the grid, reducing emissions, and strengthening the region's security of supply. This is not just another plant, but a waste and energy management model which aspires to be replicated in other parts of Spain and Europe.
A pioneering project in Palos de la Frontera
Veolia has designed, built and now operates a biogas plant integrated into the Gunvor facilities in Palos de la Frontera, specifically focused on the treatment of liquid streams from industrial processes. This is the first time in Spain that this type of energy recovery scheme has been applied to an industrial waste of this kind, producing biomethane suitable for direct injection into the natural gas network.
The heart of the project is a fully integrated circular modelIndustrial wastewater is no longer considered a simple waste product to be treated, but is recognized as a stream with high energy content. Through an anaerobic digestion process followed by an advanced purification stage, this potential is transformed into high-quality biomethane that is injected into the Andalusian gas network.
The plant began injecting biomethane into the grid at the end of December 2025This marked the completion of the commissioning phase of the gas infrastructure connection system. This milestone positions Andalusia as a leader in the development of renewable gas in southern Europe and reinforces Spain's role in the expansion of industrial biomethane at the community level.
The facility is designed to maximize the synergies between waste management, water treatment and energy productionCombining technological knowledge and operational experience accumulated by Veolia in different markets, this comprehensive approach allows the project to be presented not only as a specific solution, but also as a learning platform for future similar plants.
From Gunvor's perspective, this development is part of their strategies to decarbonization and process optimizationby incorporating a solution that manages its own waste and at the same time generates a renewable gas that can be used by the regional energy system.
Biomethane treatment and production capabilities
On an operational level, the plant processes daily 105 m³ of liquid industrial wasteFrom this relatively small volume, the process configuration allows for the recovery of a very high percentage of the energy content of these effluents, which previously were only treated before being discharged or reused.
The system is designed to generate more than 8.000 m³ of biomethane per dayIf this figure is projected over a full year of operation, production exceeds 32 GWh per year of renewable energy. According to data provided by the company, that volume is equivalent to the average energy consumption of around 9.000 Spanish householdsThis gives an idea of ​​the true scale of the project in terms of potential energy service.
The biomethane obtained meets the quality requirements demanded for injection into the natural gas networkThis means that renewable gas is mixed with conventional fossil gas and can be used for the same purposes: heating, domestic hot water, industrial processes, or electricity generation, among others. From the end user's perspective, there is no technical difference in use, but there is a difference in origin and climate impact.
By replacing an equivalent volume of fossil natural gas with locally produced biomethane, the project contributes directly to the diversification of the Spanish energy mixFurthermore, it reinforces the Andalusia's energy sovereigntyby reducing dependence on fossil fuel imports and taking advantage of resources generated within the territory itself.
This approach fits with the main lines of the European Union's energy and climate policy, which is decisively promoting renewable gases, particularly biomethane, as a key element in the decarbonization of sectors that are difficult to electrify and in the resilience of energy systems.
Applied technology: from liquid waste to renewable gas
To make this leap from a complex liquid waste to a grid-quality renewable gas possible, Veolia has deployed a set of proprietary high-performance technologieswhich are already used in other markets but which in Spain had not been applied until now to this specific type of industrial currents.
The first link in the process is a anaerobic digestion reactor with membrane technologyMarketed under the Memthane® brand, with a volume of 4.000 m³. This equipment is designed to maximize biogas production from liquid streams with a high organic load, while stabilizing the resulting effluent.
Subsequently, the raw biogas passes through a system of biological desulfurization (Sulfothaneâ„¢), which removes hydrogen sulfide (Hâ‚‚S) and other undesirable compounds. This step is key to protecting the rest of the installation, ensuring the durability of the equipment, and preventing emissions of corrosive or malodorous gases.
The final step is the upgrading unit, identified as MemGasâ„¢, which purifies the biogas to obtain biomethane meeting the quality and purity criteria established for injection into the network. In this phase, the methane concentration is adjusted and gases such as carbon dioxide and other traces are removed, so that the resulting renewable gas has a behavior comparable to that of fossil natural gas.
The combination of these three technologies in the same industrial site allows for a continuous and efficient operation, adapted to the particularities of the waste treated and designed to minimize auxiliary consumption and energy losses throughout the conversion chain.
Environmental impact and climate contribution
Beyond the purely technical aspects, the project stands out for its measurable effects on the climate and the environment. The estimated annual production of biomethane translates into a reduction of more than 8.000 tons of COâ‚‚ per yearby replacing fossil natural gas with a renewable gas with a much lower emissions balance throughout its life cycle.
According to calculations released by the company, this reduction in emissions is comparable to remove approximately 4.000 vehicles of Spanish roads each year. Although this is an approximate equivalence, it simply illustrates the scale of the climate benefit associated with the continuous operation of the plant.
The project also provides a more sustainable waste management solution for the liquid industrial streams that feed the facility. Instead of being treated solely to meet environmental discharge requirements, these wastes undergo a process that closes the loop between treatment and energy generation, fully aligning with the principles of the circular economy.
This approach reduces pressure on other treatment infrastructure, decreases the volume of waste requiring conventional solutions, and generates an energy product that can be economically valued, thus helping to improve the long-term economic viability installation.
In a context where Spain and the European Union have set increasing targets for climate neutrality and emissions reductionInitiatives like this provide concrete examples of how industrial decarbonization can advance through the integration of technologies already available on the market.
Circular economy and replicable model for industry
One of the most outstanding aspects of the Palos de la Frontera project is its status as replicable use case in other industrial settings that generate liquid streams with usable organic content. The implemented scheme demonstrates that it is possible to integrate energy recovery into the facility itself, connect it to the gas network, and align it with the climate objectives of companies and government agencies.
Veolia frames this initiative within the GreenUp strategic planThe project aims to boost local decarbonized energy production and offer comprehensive solutions that combine technological innovation, environmental sustainability, and economic balance. In this sense, the Andalusian project serves as a showcase for the group's capabilities in areas such as water, waste, and energy.
Gunvor emphasizes the exemplary nature of this experience in terms of industrial decarbonization and resource optimizationThe collaboration between the energy operator and the environmental services company allows for the integration of advanced waste management and the generation of marketable renewable gas in the same location.
The fact that biomethane is injected into the natural gas network of Andalusia This opens the door for other industrial, residential, and service sector consumers to indirectly benefit from the renewable gas produced, without requiring any modifications to their equipment. In this way, the project's benefits extend beyond the plant's perimeter and benefit the entire regional gas system.
In a country with a significant industrial base and abundant flows of liquid and organic waste, the example of Palos de la Frontera stands out as a benchmark for future developments that can consolidate the Industrial biomethane as a key vector in the Spanish and European energy transition.
Overall, the first injection of biomethane from industrial waste in Spain symbolizes the convergence between mature technology, ambitious climate goals and the pursuit of greater energy independence, making it clear that today's waste can become a relevant part of tomorrow's energy supply if well-designed circular economy solutions are integrated.