The first metro line in Qingdao started construction in 2013. By the end of 2020, Qingdao Metro has put six lines into use, with a total mileage of 246 km. It ranks top 10 cities in China in terms of total length of metro line. Qingdao Metro wants to make sure the power reliability, the efficient and stable power supply to ensure the urban rail transit are well-recognized by customers.

More than 2,000 Siemens 8DA10 medium-voltage gas-insulated switchgears have been provided to all the six metro lines in Qingdao in 8 years.