Solar Covers 55 % of Heat Demand of 1,500 Households

The new seasonal pit heat storage Sunstore 4 with a volume of 75,000 m³ is at the heart of Marstal’s extended solar district heating network. The town on the Danish island of Ærø receives 55 % of its heat from the 23 MW_th solar thermal field, of which 12.6 MW_th were installed earlier. The pit heat storage installation, the first of its kind, was a difficult undertaking - the team had to cope with heavy rainfalls in the summer and a thick layer of ice in the winter of 2012, when the underground storage was still not covered. June 2014 was the official end of EU project Sunstore4, which contributed EUR 6.1 million to the extension and the monitoring of Marstal’s district heating plant. The total budget of the Marstal extension project was EUR 15.1 million.
Photo: Sunstore4

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