The five-megawatt wind turbine used in the national wind and solar energy storage and transmission demonstration project (Photo by Zhu Pengtao)

The wind turbine and photovoltaic panel demonstration project located in Zhangjiakou, north China's Hebei province, demonstrates the city's determination to co-host a greener Winter Olympics in 2022 and march toward a sustainable development path.

As China's national wind and solar energy storage and transmission demonstration project, the Zhangjiakou project has generated a total of 6 billion kilowatt-hours of electricity since it started operation in December 2011, saving nearly 2.4 million tons of standard coal and reducing almost 6 million tons of carbon dioxide according to international standards.

Constructed and operated by the State Grid Jibei Electric Power Company Ltd., the national new energy storage and transmission demonstration project is the world's largest and most comprehensive, integrating wind and solar energy generation, storage and transmission.

Typically, new energy, characterized by its fluctuations, will affect the safe and stable operation of the power grid.

The demonstration project, however, has adopted a complete technological system to soothe such fluctuations and made it possible for new energy to be applied on a large scale.