Photo taken on March 3, 2021 shows the photovoltaic system of Donaustadt in Vienna, Austria. The photovoltaic system of Donaustadt was put into operation here on Wednesday. The system will produce over 12 gigawatt hours of electricity for 4,900 Viennese households per year.Photo:Xinhua
Photo taken on March 3, 2021 shows the photovoltaic system of Donaustadt in Vienna, Austria. The photovoltaic system of Donaustadt was put into operation here on Wednesday. The system will produce over 12 gigawatt hours of electricity for 4,900 Viennese households per year.Photo:Xinhua
Photo taken on March 3, 2021 shows the photovoltaic system of Donaustadt in Vienna, Austria. The photovoltaic system of Donaustadt was put into operation here on Wednesday. The system will produce over 12 gigawatt hours of electricity for 4,900 Viennese households per year.Photo:Xinhua
Photo taken on March 3, 2021 shows the photovoltaic system of Donaustadt in Vienna, Austria. The photovoltaic system of Donaustadt was put into operation here on Wednesday. The system will produce over 12 gigawatt hours of electricity for 4,900 Viennese households per year.Photo:Xinhua
Photo taken on March 3, 2021 shows the photovoltaic system of Donaustadt in Vienna, Austria. The photovoltaic system of Donaustadt was put into operation here on Wednesday. The system will produce over 12 gigawatt hours of electricity for 4,900 Viennese households per year.Photo:Xinhua
Photo taken on March 3, 2021 shows the photovoltaic system of Donaustadt in Vienna, Austria. The photovoltaic system of Donaustadt was put into operation here on Wednesday. The system will produce over 12 gigawatt hours of electricity for 4,900 Viennese households per year.Photo:Xinhua