As shown in the "Global Energy Storage Technology Installation". Among all kinds of technologies, pumping energy is a large -capacity energy storage method with mature technology, low cost, and the largest use of power systems. The pumping storage power station consists of reversible water pumps, water turbines and upper and lower reservoirs. When the power system is loaded, the remaining electric energy of the power system uses the remaining power system to pump from the downstream reservoir to the upstream reservoir from the power station to store the gravity energy of the electric energy into water. At the peak of the load, water is used to divert water from the upstream reservoir, drives the water turbine to power the electricity, converts the potential energy into electrical energy, and power the power system. The pumping storage technology has developed a history of nearly a century, and the capacity of large -scale pump storage power stations has reached one million kilowatts. Pumping power stations are mainly distributed in Asia, the United States and Europe. Japan ’s existing pumping storage capacity is 25.37 Gava, accounting for 17.9%of the global pumping storage capacity. It is the country with the largest scale of water pumping storage capacity in the world. In the first half of 2016, my country's pumping storage capacity was 23.64 GW, ranking second in the world. The US pumping storage capacity is 20.36 Gava, ranking third in the world. The above -mentioned Three Kingdoms pumping storage installed capacity accounts for 48.8% of the global pumping storage capacity.