Heat pumps

Envafors expands heat pump capacity as electrification reshapes district heating

6. June 2025
Envafors expands heat pump capacity as electrification reshapes district heating

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A new 10 MW heat pump project in Slagelse strengthens the long-term collaboration between Aalborg CSP and Envafors — and reflects a broader shift toward electrified district heating.

OUR IMPACT

Aalborg CSP has been awarded a turnkey EPC contract to deliver a 10 MW air-to-water heat pump for the Danish utility Envafors in Slagelse. The system will use ambient air as a heat source and renewable electricity to support local district heating supply.

The project marks the latest step in an ongoing collaboration between the two companies. It is the third joint project in recent years, following earlier investments in integrated heat pump capacity and supporting infrastructure.

The new installation is designed to integrate directly into the existing district heating system, including current energy assets. The scope covers full system delivery, including heat exchangers, piping and plant integration, with a focus on achieving cost-efficient heat production under real operating conditions.

At system level, the heat pump is configured for flexible operation. The modular setup allows output to be adjusted to demand, while maintaining stable supply across varying load conditions.

The project also reflects a wider shift in Danish district heating, where electricity is becoming a primary energy source as coal and natural gas are phased out.

WHY IT MATTERS

Large heat pumps are moving from pilot scale to core infrastructure. This project shows how electrification can be integrated into existing networks to increase capacity and reduce fossil dependency.

 

This article was originally published under Aalborg CSP and has been editorially adapted for aalborg hc systems.

WHAT WE DID

Proven at scale,
delivered worldwide

All projects
8.260 m² PTES lid solution
Dronninglund (DK)

8.260 m² PTES lid solution

1.5 MW wastewater heat pump
Stenløse (DK)

1.5 MW wastewater heat pump

10.2 MW air-to-water heat pump
Halsskov (DK)

10.2 MW air-to-water heat pump

10 MW air-to-water heat pump
Slagelse (DK)

10 MW air-to-water heat pump

18 MW geothermal heat pump station
Skejby, Aarhus (DK)

18 MW geothermal heat pump station

1 MW biomass heat pump
Solrød (DK)

1 MW biomass heat pump

1.2 MW CO₂ heat pump
Solrød / Havdrup (DK)

1.2 MW CO₂ heat pump

2.5 MW wastewater heat pump
Frederikssund (DK)

2.5 MW wastewater heat pump

11,000 m² PTES lid solution
Høje Taastrup (DK)

11,000 m² PTES lid solution

2.5 MW heat pump system
Ørum (DK)

2.5 MW heat pump system

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ANY QUESTIONS?

FAQ

What does aalborg hc systems deliver?

aalborg hc systems designs and delivers integrated heating and cooling systems in new and existing networks.

This includes:

  • large-scale heat pumps
  • thermal energy storage (TES and PTES)
  • integration of multiple heat sources

The focus is on complete system solutions, not standalone technologies.

Can you integrate into existing district heating plants?

Yes. Most projects involve integration into existing infrastructure. aalborg hc systems connects new technologies to:

  • existing networks
  • boilers and CHP units
  • available heat sources

The result is a coordinated system upgrade, not a replacement of existing assets.

Do you act as EPC contractor?

Yes. aalborg hc systems delivers projects on an EPC basis.

This covers:

  • engineering and system design
  • procurement and supplier coordination
  • construction and commissioning

The responsibility remains with one party from concept to operation.

Which heat sources can you integrate?

aalborg hc systems integrates multiple heat sources within one system, including:

  • wastewater
  • geothermal energy
  • ambient air
  • industrial excess heat

Solutions are designed as source-agnostic systems, optimised for local conditions.

What do you need to get started?

A project can start with a limited set of data:

  • heat demand profile (load curve)
  • supply and return temperatures

Based on this, aalborg hc systems defines a first system concept and integration approach.