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 |