Sønderborg municipality optimistic over geothermal plan  

2009.07.07
In Sønderborg in southern Jutland, seismology experts have discovered an underground reservoir of hot water that could be used to supply district heating to 5,000 households
Two kilometres below the surface in the municipality of Sønderborg in southern Jutland, seismology experts have discovered an underground reservoir of hot water that could be used to supply district heating to 5,000 households, reports professional journal Ingeniøren (The Engineer).
 
After several years of investigative work into potential geothermal energy exploitation, there is now optimism that a geothermal solution for district heating could become a reality. Project manager Niels Otto Clausen from consulting engineers COWI told Ingeniøren: "Seismic surveys and some ultrasound measurements have been done that show that the prospects are good, and we hope that there is sufficient water down there."
 
The temperature of the water in the underground reservoir is 63ºC, so it will need heating to reach the 80ºC necessary for integration with the existing district heating infrastructure. It is being proposed that the additional energy required to achieve this is supplied either by a heating plant fuelled by waste, or by a new biomass-fired boiler. Using an electrically operated heat pump has already been ruled out on cost grounds.
 
COWI and the district heating authority in Sønderborg estimate that the geothermal plant, which could be up and running by the end of 2011, will be able to supply Sønderborg with heat for the next 25 years.

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