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Claus Ekman, adm. direktør i Synergi, ser stort potentiale i overskudsvarme til at fortrænge gas i boligopvarmningen.
Synergi

Holbæk agrees to guarantee for large surplus heat project on Zealand

A majority of Holbæk Municipality's municipal council has approved a letter of intent for a financial guarantee for a surplus heat project that will supply green heat to more than 50,000 households.
23. APR 2026 11.11
Energi
Gas

HOLBÆK / KALUNDBORG: The Surplus Heat for Zealand project, which aims to ensure the utilization of surplus heat from the industry in Kalundborg has come a step closer to realization, after a majority in Holbæk Municipality's municipal council has approved a letter of intent to provide a financial guarantee. The project can supply district heating to more than 50,000 households on Zealand. This is stated by Synergi in a press release.

Kalundborg Municipality has previously made a similar decision, and the municipal guarantees are crucial to realizing the project, which is expected to cost around 5 billion DKK in total. At the same time, work is being done to secure 1 billion DKK in support from the EU's Innovation Fund, while the rest of the financing will be found through, among other things, foundations and municipally guaranteed loans.

The project involves feeding surplus heat from the industry in Kalundborg into the district heating network instead of being lost. This means that, among other things, gas can be replaced in heating, which according to Synergi can actually be a 'game changer' for the green transition of home heating.

- This is exactly the type of project that can move the green transition of home heating from ambition to reality. We have a huge energy source right in front of us in the form of surplus heat, which all too often goes to waste. If we succeed with projects like this, Denmark can show how to both lower emissions and use energy much more intelligently. The prospects are enormous, says Claus Ekman, CEO of Synergi.

According to Synergi, only 13 percent of industrial surplus heat is currently recycled in Denmark. At the same time, an analysis from Danfoss shows that 2,860 TWh of surplus heat is lost in Europe.

- Surplus heat is Europe's largest untapped energy source. We need to become much better at reusing surplus heat for both home heating and production. This could be a huge win for the climate, as we both reduce the need for oil, coal and gas and at the same time reduce the load on a stressed electricity grid by utilizing surplus heat much more efficiently, says Claus Ekman.

In Denmark, 11.4 TWh of surplus heat is wasted annually. Today, surplus heat accounts for 3.5 percent of district heating, but according to the Danish Heating Plan, the entire district heating consumption in 2045 can be covered by surplus heat and geothermal energy.

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https://www.doi.dk/en/innovation/artikel/holbaek-siger-ja-til-garanti-for-stort-overskudsvarmeprojekt-paa-sjaelland

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