The construction site of a new windmill is seen on the Saint Gotthard mountain pass, Switzerland September 3, 2020. On the central pass, at about 2,130 metres above sea level, Azienda Elettrica Ticinese (AET) builds a wind power station of five 80 metre-high windmills which will start in November to produce some 20 GWh of electricity per year, which is enough to supply 5000 households. REUTERS/Arnd Wiegmann