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French company AbSolar is innovating with a revolutionary solar thermal power plant that combines solar and geothermal energy to produce decarbonized energy. Located in Cadaujac, near Bordeaux, this project stands out for its ability to provide heating and hot water to an entire housing development through an urban heating network. This technological advancement earned AbSolar the Innov’Climat 2024 award from Ademe. Let’s explore the details of this unique power plant that could transform the French energy landscape.
A Solar Thermal Power Plant at the Heart of Innovation
The solar thermal power plant developed by AbSolar is a technological marvel that relies on the combined use of solar and geothermal energies. Featuring 940 m² of solar collectors capable of reaching temperatures of 90°C, this facility is designed to maximize energy efficiency. The underground closed-loop energy storage system plays a crucial role, allowing for the storage and redistribution of excess heat. Sixty boreholes measuring 32 meters deep house U-shaped geothermal probes made from cross-linked polyethylene, capable of withstanding temperatures up to 85°C. This ingenious mechanism ensures energy continuity, even when the sun is not shining.
The short-term energy storage, featuring two tanks of 50 m³, is essential for regulating solar production and preventing overheating during the summer. This infrastructure guarantees that temperatures do not rise too quickly, thereby preserving the integrity of the system. In short, this plant is not just a model of innovation but also a demonstration of the efficient use of natural resources for a greener future.
The Urban Heating Network: A Local and Sustainable Solution
In Cadaujac, the urban heating network established by AbSolar supplies 67 homes with heating and hot water. Residents benefit from decarbonized and local energy, reducing their dependence on fossil fuels. This network operates in two modes: the “free heating” mode, where heat is directly injected into the system, and the C2SES mode, which powers a heat pump during winter. With an annual subscription fee ranging from €300 to €400 per household, this system offers an economical and ecological solution for residents.
The installation of a decoupling tank in each home ensures a safety backup, guaranteeing a continuous supply of heat. This model could be replicated in other regions of France, pending environmental authorization for mining works. In fact, the nature of the subsurface and the availability of land are key factors in establishing such power plants. The Cadaujac initiative could inspire other communities to adopt similar solutions, contributing to the country’s energy transition.
The Challenges and Perspectives of Solar Thermal Energy
The creation of this solar thermal power plant presents several challenges, particularly in terms of regulation and logistics. Obtaining environmental authorization for mining works is a crucial step, as it is essential to preserve underground water resources. Furthermore, land availability is another obstacle, especially in urban areas where space is limited.
Despite these challenges, the prospects offered by this type of energy are promising. Peri-urban areas, with sufficient surfaces to be developed, are ideally situated to host such installations. Moreover, this technology allows for overcoming the intermittency issues associated with solar energy, thanks to its innovative storage system. The increasing adoption of these solutions could play a key role in reducing carbon emissions and promoting a sustainable energy future. The advancements made by AbSolar pave the way for a more intelligent and respectful use of our natural resources.
A Model for the Energy Future
AbSolar’s initiative in Cadaujac serves as an inspiring model for sustainable development. By combining solar and geothermal technologies, this power plant demonstrates that ecological and viable energy solutions are possible. The project not only provides clean energy but also improves the living conditions for residents through a reliable and economical infrastructure.
The plant’s 10,000 m³ storage capacity ensures energy continuity, even during periods of low sunlight. With an efficiency of 56%, this system has stored 340 MWh for 180 MWh returned. This impressive energy balance showcases the potential of this technology to meet growing energy demands while minimizing environmental impact. AbSolar is thus setting the groundwork for a future where renewable energy will be at the heart of our daily lives. What will be the next step to expand this innovation on a larger scale and sustainably change our relationship with energy?
