Herzog & de Meuron has offered an insight into construction at the HKJC Conghua Racecourse Grandstand in Guangzhou, China. A new video from the site, posted on the firms Instagram, shows the grandstands catenary roof being installed, which holds 20,000 photovoltaic panels.When completed, the roof will be capable of meeting the complexs operational energy use. The hanging roof drops down to nearly ground level, its gently curved silhouette and green tone echoing the dense tree canopies covering the surrounding mountains and valleys, the firm adds.Completion of the scheme is expected by 2026.