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District energy

District heating

Energy efficiency in industry


11,000 m2 insulating lid solution for PTES, Denmark

4. February 2022

Solution provider

Aalborg CSP
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Client:     Høje Taastrup Fjernvarme a.m.b.a. and VEKS
End user/Owner:    Høje Taastrup Fjernvarme a.m.b.a. and VEKS
Location:    Høje Taastrup (near Copenhagen), Denmark
Status:    Under construction

Aalborg CSP received the order from the two Danish utility companies, Høje Taastrup Fjernvarme and VEKS, to design and deliver a 11,000 m2 insulating lid for the parties 70,000 m3 Integrated PTES system in Høje Taastrup near Copenhagen, Denmark.

Lid design increases the efficiency and reliability of the PTES and ensures long-term durability

The PTES in Høje Taastrup is a thermal storage functioning as a thermal battery with a capacity of 3,300 MWh. The thermal battery is charged by heat from the transmission grid and discharged to the district heating network when the demand for heating increases. The heat is stored, when the price on heating is low and is utilized later on, when the price for heating increases. This project is an example of flexible and efficient sector coupling of electricity and district heating.

The PTES solution from Aalborg CSP prevents accumulation of air, water and moisture inside the insulation in an efficient way and thereby helps increase the efficiency and reliability of the storage as well as ensures long-term durability.

“It is the first time this type of storage is used in one of the very large district heating networks in Denmark. The project is a development project. To further optimize the durability and lifetime expectancy of the storage, we have worked with different types of technical solutions, when it comes to, among other things, material selection. We chose the new PTES lid solution from Aalborg CSP, as we believe that it is a reliable solution, which will help ensure a low heat loss.” – says Astrid Birnbaum, CEO, Høje Taastrup Fjernvarme A.m.b.a.

Unique design features allow for vapour to diffuse out as well as ensure a safe and efficient rainfall handling.

The 11,000 m2 lid in Høje Taastrup is divided into 10 sections and thus includes 10 pumping wells, which will lead rainwater away from the surface of the storage.


Client/Owner: Høje Taastrup a.m.b.a. and VEKS
Capacity of the PTES: 3,300 MWh
Volume of the PTES: 70,000 m3
Area - PTES lid: 11,000 m2
No. of customers: 500,000
Location: Høje Taastrup, Zealand, Denmark
Expected lifetime of lid:        30 years
CO2 savings: 15,000 tons COper year