The development of biogas plants in Spain is generating intense social debate as initiatives multiply across the country. In recent months , several projects have garnered attention both for their institutional and business support and for the opposition they provoke from local residents, especially in rural areas and those near residential areas or tourist destinations.
Currently , regions like Aragon and Catalonia lead the way in the number of projects under development and plants in operation, reflecting a strong commitment to the valorization of organic waste and the generation of renewable energy . However, the lack of consensus on their location and potential environmental impact keeps the controversy alive in many localities.
Institutional drive and territorial challenges
In Aragon , concerns about sustainable development and efficient waste management have driven the processing of more than 50 biogas and biomethane projects. The Aragon Council for Nature Protection has urged territorial planning and the creation of a specific strategy to regulate the implementation of these facilities, giving particular consideration to the region's potential in the agri-food sector. Experts emphasize the importance of ensuring that the plants address local problems, such as manure management, and that they adhere to the principles of the circular economy, while also optimizing the use of the digestate resulting from anaerobic digestion.
Technical experts warn of the potential environmental risks associated with digestate and call for specialized teams for rigorous monitoring to prevent conflicts with the local population. Meanwhile, it is acknowledged that the number of biomethane plants in Spain is still very small compared to other European countries, highlighting that there is still much work to be done.
Catalonia is also investing heavily in this energy source, and already has around 72 biogas plants in various stages of operation, distributed among livestock facilities, food industries, and urban wastewater treatment plants. Most of the technologies implemented come from other European countries, indicating a lack of local specialization and the need to develop its own innovations.
The report from the Generalitat highlights the strategic role of biogas in the energy transition, but points out that social acceptance and impact management are outstanding issues, especially in rural areas where there are fears of the concentration of energy infrastructure and the loss of control by local communities.
Neighborhood mobilizations and rejection of new plants
The expansion of new biogas plants is facing increasing opposition from citizen groups and neighborhood associations in several regions. In municipalities like Azlor (Huesca) , the proposal for a new plant has been met with immediate mobilization: more than 700 signatures were collected in just 24 hours to halt its construction. Residents cite potential problems with odors, emissions of compounds such as ammonia , and the impact on health, agriculture, and tourism . The movement demands greater transparency and rigorous environmental studies before any decisions are made.
Similar situations are occurring in Aldeaseca (Ávila) and Arenas de Cabrales (Asturias) , where residents have staged large-scale protests. In Aldeaseca, neighborhood associations criticize the environmental permit granted to the plant and believe that their objections and public opposition have been ignored. They point to the threat to local cooperatives and believe the process lacks sufficient public consultation . In Cabrales, some 620 people (from a municipality of barely 2.000 inhabitants) demonstrated against the construction of a plant near tourist attractions, citing safety risks, odor problems, and a lack of transparency in the project's management.
Also in Las Torres de Cotillas (Murcia) , citizens will have the opportunity to express their opinion through a public consultation —the first of its kind in the region—regarding the installation of a biogas plant promoted by a major company in the sector. Although investment and job creation are expected, some residents and politicians warn that the location is not the most suitable due to its proximity to the town center and the potential negative impacts on quality of life. The City Council has created a technical committee to oversee the process, although the exclusion of the opposition and neighborhood associations has been criticized for a lack of participation and transparency.
Technological advances and business perspective
The biogas sector maintains an optimistic outlook regarding its contribution to the circular economy and clean energy generation, but acknowledges that significant technical and social challenges remain. Promoters argue that current technology allows for odor control through closed systems and that material transport can be organized to minimize disruption. Furthermore, they highlight the value of digestate , which can be used as fertilizer under appropriate conditions and helps complete the nutrient cycle.
However, the viability of many facilities depends on aid and subsidies, and the lack of incentives limits their expansion. It is essential to inform and engage in dialogue with communities to avoid misinformation and promote greater social acceptance . Economic and employment benefits must be distributed equitably, ensuring that planning takes into account both environmental protection and the interests of local residents.
Future challenges: social integration and energy model
The increase in biogas projects in Spain represents an opportunity to manage waste more sustainably and diversify the energy mix. However, achieving a participatory and transparent model is fundamental . Citizen involvement, consultation in decision-making, and measures to control odors and emissions are essential for these facilities to be integrated without generating social resistance.
With appropriate policy and effective communication, biogas can contribute to climate neutrality and boost rural areas, provided that solutions adapted to each territory are prioritized, benefits are shared, and high environmental standards are guaranteed to reduce risks.
