Solar District Heating in Nykobing

The solar thermal district heating plant in Nykobing, on the Danish island of Sjælland, started operation in July 2014, after one year of construction time. The official inauguration in September coincided with the celebration of the 50th anniversary of the district heating network. Nykobing is one of the very few plants above 14 MWth (20,000 m2 collector area) in Denmark at the time of inauguration. The predicted solar share is 19 %. Additional heat is provided by a gas boiler, two gas engines and a 1.2 MW pellets boiler. Like most Danish solar plants, it has large-scale, ground mounted collectors, specially designed for district heating applications. The solar plant is installed on pasture land for sheep.  
Photo:  Arcon


Name of project / installation site

Nykobing Sj., a town on the Danish island Sjælland



Start of operation

July 2014


Solar district heating

Gross collector size

20,084 m2 flat plate collectors/14 MW

Storage size

6,000 m3 steel tank

Supplied process / network

District heating network for 1,850 households with a supply temperature of 78 °C and a return temperature of 40 °C  

Predicted specific solar yield per year

 473 kWh/m2a

Predicted solar share

 19 %


Nykøbing Sjælland Varmeværk, Denmark

Planning / construction

COWI, Danish consultancy group

Collector manufacturer

Arcon Solar, Denmark


Klaus Hansen, Manager of Nykøbing Sjælland Varmeværk,

More information


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