Aalborg CSP was selected as turnkey supplier of a 1.5MW electrical wastewater heat pump system for the Danish district heating plant Egedal Fjernvarme. The new heat pump will enable Egedal Fjernvarme to utilize the energy from wastewater for green district heating production.


Client:       Egedal Fjernvarme
Location:   Stenløse
Status:    Under construction
Technology:    Heat pump system
Capacity:    1.5MW
Contract type:    EPC

Best price per MWhth heat delivered

Egedal Fjernvarme is experiencing an increased demand following the expansion of the district heating network. With the new heat pump Egedal Fjernvarme is able to exploit the excess energy from a local wastewater treatment plant to supply green district heating. The heat pump applies the natural refrigerant CO2 and will have a maximum output of approx. 1,500 kW and thereby contributes to ensuring sufficient heating capacity to supply both current and future district heating customers. The system is, likewise, custom made to guarantee that the consumers obtain as high an amount of kWh district heating as possible from the kWh of electricity supplied to the heat pump.

Sustainable and flexible system

The heat pump extracts the energy from the purified wastewater and uses the energy for heating the district heating water. The low-temperature energy is compressed into remote energy at a normal flow temperature of up to 75°C by means of the electric heat pump. The wastewater is cooled as the energy is extracted. The process of cooling the wastewater is controlled in a way that prevents the lowest outlet temperature to fall below 2 °C. Afterwards, the purified and cooled wastewater is discharged into a nearby river.


  • Design and delivery of heat pump system
  • Design and delivery of pipping (valves, drain, headers etc.) 
  • Design and delivery of civil works
  • Mechanical and electrical installation
  • P&I diagrams and control system
  • 3D model
  • Strength and flex calculations
  • Documentation
  • Supervision of installation and commissioning
  • Legalization of the plant


Andreas Zourellis
VP Sales - International
District heating / industrial solar technologies
Phone: +45 50 30 00 25 
E-mail: azo@aalborgcsp.com