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Sign upJanuary 15, 2026
Groupe E
Fribourg
This project will be implemented by ExerGo and other partners in the horizon 2025-2026. CO2 makes it possible to efficiently collect, transport and deliver energy from the environment to the high-capacity heat pumps used by Groupe E to decarbonise the existing water-based district heating network. The compactness of the CO2 solution offers many advantages in terms of implementation, not least because there is a significant difference in height between the source and the heat pumps, which would make laying larger pipes much more difficult and costly. The use of oil-free CO2 avoids the utilization of glycolized-water circuit, that would be necessary to avoid icing of the circuit in winter, when the river water is close to the freezing point. This aspect allows to reduce the environmental risks in case of fluid leakages.
The installation using CO2 allows renewable energy to be injected into the thermal grid, avoiding the use of fossil fuels. The plant will eventually produce 70 GWh of heat per year, saving approximately 13,000 tonnes of CO2eq per year that would be emitted if fossil fuels were used to generate this heat. Thanks to the denivelation between the source and the heating users, the CO2 circuit is pump-free and no energy is required to allow the fluid to circulate (thermosyphon effect).
ExerGo's CO₂ networks provide sustainable, affordable and efficient heating and cooling services to cities and communities around the world. Using natural resources such as lakes, rivers, oceans, geothermal energy or waste heat, ExerGo's thermal networks efficiently distribute energy using CO₂ in a closed loop. The excellent energy-carrying capabilities of CO₂ allow a thermal network to be deployed in a densely populated area using small flexible pipes. This helps to save high costs and time for construction and piping, enabling utilities, municipalities, private and public companies to accelerate the decarbonization of building heating and cooling in dense urban areas, where a CO₂ network can act as a smart thermal grid, optimizing supply and demand between users all year round. Compatible with standard HVAC systems and heat harvesting technologies, ExerGo networks are suitable for various residential, commercial and industrial applications.
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