In recent years, the expansion of biogas plants has generated considerable debate in Spain. While public administrations, companies, and industry associations defend these facilities as a key element in the energy transition process, a growing number of neighborhood groups and local political parties are expressing their doubts and concerns about the potential environmental, social, and health impacts of these projects.
The use of biogas as a renewable energy source has gained prominence throughout the country, especially given the need to reduce dependence on fossil fuels and meet decarbonization targets. However, the location of these plants, their size, and the type of waste they process have led to the emergence of citizen platforms and calls for greater oversight and studies on the real effects they may have on inhabited areas.
Biogas: an opportunity for energy transition and rural development
Biogas is obtained from the anaerobic decomposition of organic waste , such as slurry, manure, or agricultural residues, generating a gas composed mainly of methane and carbon dioxide. This technology allows waste to be transformed into usable energy, thus contributing to the circular economy model and the reduction of greenhouse gas emissions.
Business associations in the energy sector, such as APPA Renovables , emphasize that boosting biogas and biomethane is a priority for Spain. Currently, only 0,15% of the gas consumed in the country comes from renewable sources , despite the considerable potential for producing biogas from available resources. Experts stress that the Spanish system remains heavily dependent on fossil fuels, and the penetration of these renewable alternatives is insufficient to achieve the climate goals set for the next decade.
The sector argues that the implementation of biogas plants boosts the rural economy , creates skilled jobs, allows for the valorization of agricultural and livestock waste, and promotes sustainable agriculture. Furthermore, part of the digestate obtained after biogas production can be used as a natural fertilizer, closing the material cycle and minimizing waste.
Neighborhood concerns and associated risks
However, the development of new plants is not without controversy. In several autonomous communities, neighborhood groups have emerged demanding greater distances between the facilities and urban centers, as well as a more thorough assessment of their environmental and social impacts.
In places like the municipality of GuÃa, in Gran Canaria, the proposal for a biogas plant just 500 meters from homes , schools, and senior residences has sparked intense opposition from residents. The main concerns revolve around the emission of unpleasant odors , the increase in truck traffic, potential leaks of toxic gases such as methane, and the negative impact on quality of life. Testimonies gathered from other Spanish towns already living with these types of facilities report episodes of foul smells and constant disturbances.
Political representatives and association members, for their part, point out that, although developers claim that measures have been adopted to prevent emissions, the level of control and oversight is not always adequate. They also warn of the risk that the implementation of a plant could serve as a precedent for future similar industries or large livestock farms in the area.
Project adaptation: the example of Hazas de Cesto and corrective measures
Social pressure and environmental awareness have sometimes forced the revision and modification of initial projects. In towns like Hazas de Cesto (Cantabria), regional authorities and technical experts have demanded significant improvements from the developer: reducing the size of the plant , investing in safer processes, ensuring that waste is stored only in closed tanks, implementing advanced odor control systems, and reducing the environmental impact.
The public administration has emphasized that the latest projects are being processed under rigorous technical scrutiny and with a greater volume of public comments that must be considered before granting authorization. Furthermore, the planned investment has been doubled to ensure that the waste treated is exclusively of livestock origin, such as slurry and manure, and that operations are carried out in enclosed environments, thus limiting unwanted emissions.
Regulations, moratoriums and the challenge of coexistence
In some municipalities, the debate on urban planning and environmental protection has led to the adoption of moratoriums that temporarily suspend the authorization of new biogas plants, while urban plans are reviewed and the risks and benefits of these infrastructures are assessed.
Municipalities like Barbastro have initiated processes to halt new authorizations until they have a clearer regulatory framework adapted to the current situation. The prevailing position is that any progress in renewable energy must be made with criteria of planning, social participation, and protection of residents' quality of life.
In Catalonia, the environmental impact assessment for the La Sentiu de Sió plant has recognized that, although filtration and design technologies can reduce the impact, there is a risk of generating unpleasant odors that could affect nearby residential areas. Therefore, the government is requesting odor dispersion studies and corrective measures in the event of incidents.
The deployment of new biogas plants in Spain continues, but amidst intense social and political debate about their benefits, risks, and the need to balance energy innovation with citizen well-being. Pressure from local residents, demands for rigorous environmental procedures, and calls for specific regulations reflect the complexity of transforming waste management into an energy source without compromising quality of life or harming the natural environment.
