Denmark: 52,500 m2 additional collector area in Vojens

Since 2012, Vojens Fjernvarme has been a satisfied customer of a solar district heating installation. The experiences made with the 17,000 m² large collector field convinced the municipal utility from the south of Denmark to plan adding another 52,500 m² (36.75 MW_th) to the field as well as seasonal storage, which should increase the annual solar share from the 14 % measured in 2014 to an expected 45 %. The photo shows the new fields  with a total of 36.75 MW_th on the left and the old field with 12.25 MW_th on the right. The seasonal storage is situated on the top left of the photo with a triangle form is was not yet filled when the photo was taken.
Photo: Arcon-Sunmark

Grid temperatures have been set low to match the solar feed-in – they are 75 °C/37 °C and 77 °C/40 °C in summer and winter, respectively. Arcon-Sunmark sees solar heat prices, including seasonal storage, at 47 EUR/MWh, compared to heat prices of 57 EUR/MWh for natural gas supply, as natural gas taxation has been at 0.0295 EUR/m³. Hence, the megawatt plant is a purely commercial project, which has not been supported by direct subsidies. The installation was commissioned Mid May 2015 and officially inaugurated on 12 June 2015.

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