Photo taken on March 18, 2021 shows the Zhangbei flexible direct current (DC) power grid project in Zhangjiakou, north China's Hebei Province. It is the world's first DC power grid and will be able to deliver about 14 billion kilowatt-hours of clean energy per year. The project will guarantee a 100 percent green power supply for the Beijing 2022 Winter Olympic venues.

Photo taken on March 18, 2021 shows the Zhangbei flexible direct current (DC) power grid project in Zhangjiakou, north China's Hebei Province. It is the world's first DC power grid and will be able to deliver about 14 billion kilowatt-hours of clean energy per year. The project will guarantee a 100 percent green power supply for the Beijing 2022 Winter Olympic venues.

Photo taken on March 18, 2021 shows the Zhangbei flexible direct current (DC) power grid project in Zhangjiakou, north China's Hebei Province. It is the world's first DC power grid and will be able to deliver about 14 billion kilowatt-hours of clean energy per year. The project will guarantee a 100 percent green power supply for the Beijing 2022 Winter Olympic venues.

Photo taken on March 18, 2021 shows the Zhangbei flexible direct current (DC) power grid project in Zhangjiakou, north China's Hebei Province. It is the world's first DC power grid and will be able to deliver about 14 billion kilowatt-hours of clean energy per year. The project will guarantee a 100 percent green power supply for the Beijing 2022 Winter Olympic venues.

Photo taken on March 17, 2021 shows the National Ski Jumping Center in Chongli District of Zhangjiakou City, north China's Hebei Province. The venue, nicknamed "Snow Ruyi", will host ski jumping competitions during the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the National Ski Jumping Center in Chongli District of Zhangjiakou City, north China's Hebei Province. The venue, nicknamed "Snow Ruyi", will host ski jumping competitions during the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the National Ski Jumping Center in Chongli District of Zhangjiakou City, north China's Hebei Province. The venue, nicknamed "Snow Ruyi", will host ski jumping competitions during the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the "Ice Jade Ring", which is an elevated pedestrian walkway that will eventually connect the National Ski Jumping Center, National Cross Country Center, and National Biathlon Center in the Zhangjiakou Competition Zone of the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the National Biathlon Center in Chongli District of Zhangjiakou City, north China's Hebei Province. It will be the venue for biathlon events of the Beijing 2022 Winter Olympic and Paralympic Winter Games.

Photo taken on March 17, 2021 shows the National Biathlon Center in Chongli District of Zhangjiakou City, north China's Hebei Province. It will be the venue for biathlon events of the Beijing 2022 Winter Olympic and Paralympic Winter Games.

Photo taken on March 17, 2021 shows the Genting Snow Park in Chongli District of Zhangjiakou City, north China's Hebei Province. The venue will host freestyle skiing and snowboard competitions of the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the Genting Snow Park in Chongli District of Zhangjiakou City, north China's Hebei Province. The venue will host freestyle skiing and snowboard competitions of the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the Genting Snow Park in Chongli District of Zhangjiakou City, north China's Hebei Province. The venue will host freestyle skiing and snowboard competitions of the 2022 Beijing Winter Olympics.

Photo taken on March 17, 2021 shows the Zhangjiakou Winter Olympic Village in Chongli District of Zhangjiakou City, north China's Hebei Province. The construction of the Winter Olympic Village in Zhangjiakou has been completed and follow-up work will be done to improve the infrastructure and greenery in the area.

Photo taken on March 17, 2021 shows the Zhangjiakou Winter Olympic Village in Chongli District of Zhangjiakou City, north China's Hebei Province. The construction of the Winter Olympic Village in Zhangjiakou has been completed and follow-up work will be done to improve the infrastructure and greenery in the area.

Photo taken on March 17, 2021 shows the Zhangjiakou Winter Olympic Village in Chongli District of Zhangjiakou City, north China's Hebei Province. The construction of the Winter Olympic Village in Zhangjiakou has been completed and follow-up work will be done to improve the infrastructure and greenery in the area.

Photo taken on March 17, 2021 shows the Zhangjiakou Winter Olympic Village in Chongli District of Zhangjiakou City, north China's Hebei Province. The construction of the Winter Olympic Village in Zhangjiakou has been completed and follow-up work will be done to improve the infrastructure and greenery in the area.

Photo taken on March 17, 2021 shows the Zhangjiakou Winter Olympic Village in Chongli District of Zhangjiakou City, north China's Hebei Province. The construction of the Winter Olympic Village in Zhangjiakou has been completed and follow-up work will be done to improve the infrastructure and greenery in the area.