The Danish Energy Agency's monitoring of surplus heat from 2023 shows that 3.5 percent of district heating production was based on surplus heat, corresponding to 1,315 GWh. This is reported by Dansk Fjernvarme.
According to the Danish Energy Agency's Climate Status and Projection 2024, surplus heat is expected to cover 5,100 GWh in 2035, corresponding to approximately 12 percent of district heating production. The majority is expected to come from heat pumps based on low-temperature surplus heat sources, while the rest will come from direct surplus heat from industry.
Aalborg University's analysis Heating Plan Denmark 2021 estimates that surplus heat from industry can cover approximately 10 percent of district heating production in 2030 and up to 15 percent in 2045. In addition, surplus heat from data centers can contribute an additional 8 percent. in 2045, equivalent to heating approx. 500,000 homes.
In 2023, the use of surplus heat decreased by 8 percent compared to the previous year. The surplus heat was supplied by 58 companies, distributed across 36 district heating networks. The two largest suppliers accounted for over half of the total surplus heat supply, while the 10 largest accounted for approx. 80 percent.
Surplus heat is an important resource, both when used directly and when it requires temperature increase. Increased utilization can contribute to lower energy prices and reduced CO2 emissions.
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