Denmark has two active geothermal district heating plants, one in Thisted which started in 1988,[1] and one in Aarhus, started in 2025.[2]
Two others have stopped working. A facility in Sønderborg failed in 2018 due to silting. One in Copenhagen started in 2005,[3] and stopped in 2019.
The underground temperature is under 100°C (212°F), reducing thermodynamic efficiency so electricity production is not feasible. Their geothermal heating is used as heat input to electric heat pumps (consuming grid electricity) to heat buildings.
