This is the first retractable solar folding roof worldwide over the sewage plant in Chur, Switzerland. The unique lightweight construction enables the double use of infrastructure areas for decentral solar power generation. The high power need of a sewage plant lead to 100% self consumption. Because the solar folding roof is very lightweigt its not weather proof. Therefore it is retracted under severe weather conditions like hail, snow or wind above 50km/h. The fully automatic weather algorithm takes care of the safety using local real weather data and external forecast data. The retractable function is an important feature for any maintenance of the sediment tanks to remove technical installation by a crane.
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