Sønderborg

Member state DENMARK
   
Case study Sønderborg
Description Sønderborg Fjernvarme
(the local consumer owned district heating company)
Region>City>location Sonderborg
Owner Sønderborg Fjernvarme (the local consumer owned district heating company)
Operator Sønderborg Fjernvarme
Installed capacity
( MWth)
145
Installed geothermal capacity 12 MW (29 MW including absorption heat pump driving heat)
DH length
(m)
309 km
Inhabitants connected 9525 (27000 inhabitants in town)
Design of the DH Water based with pre-insulated pipes
subsurface and surface
technical schemes
One production and one injection well. Absorption heat pumps driven by wood chip boiler.
significant pictures if any  
 Operating Temperature of the DH Winter/summer: Supply: 83/80 °C; Return: 42/46 °C
Temperature of the geothermal ressource
(production – injection)
48 ° C / 15 ° C
Geothermal flow
rate
Up to 335 m3/h
Heat Pump
if any
(power in Mwe and COP)
Absorption heat pumps: 12 MWth / COPth 1,7
Production of heating and/or cooling For district heating
Others uses
(drinking water, cascade uses…)
No, but the heat pumps are also used for flue gas cooling.
Dates of begining and end of construction 2009-2013
Planing of the operation
(from pre-studies to full completion)
2007-2013
Organisational scheme  
Administration scheme  
Investement for
geothermal well
 
Investement for
geothermal heating station
 
Investement for
DH network and substation
Not part of geothermal plant
Financing
(banks, funds, PPP…)
Owner, including former co-owner
Amount of Subsidies
if any
 
Difficulties faced Primary target reservoir not found, however secondary target better than expected. Delivery delays.
Administrative permits Licence for exploration and exploitation of geothermal energy for the purpose of district heating pursuant to the provisions of the Danish subsoil act. Approval from municipality for heat production pursuant to the provisions of the Danish heat supply act. Approval from municipality for discharge of limited amounts of geothermal water to the sea.
Cost of the produced MWh  
Cost of the MWh sold Not applicable. Consumers pay all costs for heat from the net. This includes network costs and costs for heat production from different heat production units.
Comparison with fossil energies   
Final energy cost structure  
Taxes  
Pay back  
Innovation if any The use of absorption heat pumps driven by wood chip district heating boiler, which makes it free to drive the heat pumps. The heat pumps are also used to extract heat from the flue gas.heat pumps driven by straw district heating boiler, which makes it free to drive the heat pumps.
Engineering  

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