Member state DENMARK
Case study Amager
Description Hovedstadsområdets Geotermiske
Samarbejde (HGS) (joint venture between
four energy, transmission and distribution
Region>City>location Amager
Owner Hovedstadsområdets Geotermiske Samarbejde (HGS) (joint venture between four energy, transmission and distribution companies)
Operator DONG Energy (geothermal loop incl. heat exchangers) and HOFOR (heat pump plant)
Installed capacity
( MWth)
Installed geothermal capacity 14 MW (27 MW including absorption heat pump driving heat)
DH length
> 2000 km
Inhabitants connected > 60000 (> 1 million inhibitants)
Design of the DH Water based transmission and local networks with pre-insulated pipes
subsurface and surface
technical schemes
One production and one injection well. Direct heat exchange and absorption heat pumps.
significant pictures if any
 Operating Temperature of the DH Local net, winter/summer: Supply: 89/80 °C; Return: 52/48 °C
Temperature of the geothermal ressource
(production – injection)
74 ° C / 17 ° C
Geothermal flow
Up to 235 m3/h
Heat Pump
if any
(power in Mwe and COP)
Absorption heat pumps: 13 MWth / COPth 1,8
Production of heating and/or cooling For district heating
Others uses
(drinking water, cascade uses…)
Dates of begining and end of construction 2001-2005
Planing of the operation
(from pre-studies to full completion)
Organisational scheme  
Administration scheme  
Investement for
geothermal well
15 million euro for two wells
Investement for
geothermal heating station
13 million euro
Investement for
DH network and substation
Not part of geothermal plant
(banks, funds, PPP…)
Amount of Subsidies
if any
1 million euro for seismic survey from national funding
Difficulties faced Increased injection pressure partly reduced by clean up pumping and soft acidizing.
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 geothermal water to the sea after mixing with cooling water from power plant.
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 No tax on heat from the subsurface, but taxes on energy used at the plant and on equipment.  VAT on all costs for the plant.
Pay back  
Innovation if any The use of absorption heat pumps driven by different heat sources including biomass CHP and incineration CHP, which in some cases makes it free to drive the heat pumps.

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