There are three main types of electric energy storage technology in the industry, namely hydropower energy storage technology, compressed air storage technology, and flywheel energy storage technology. Hydraulic energy storage technology is the oldest, most mature technology, and the largest commercialization technology of equipment capacity. There are about 500 hydraulic energy storage power stations in the world, of which 35 are more than 1000MW. The hydraulic energy storage system generally has two large reservoirs, one is in a lower position, and the other is located in a higher increase. During the low peak period of electricity, the water was delivered from a lower place to a reservoir with a lower position to the storage reservoir to store it. When electrical energy is needed, the potential energy of the high -level reservoir can promote the power generation of water energy machines.

Compressed air storage is to transport air pressure to underground salt mines, abandoned stone mines, underground water storage layers, etc. during the low peak period of electricity. When the electric load is large, the compressed air can burn with the fuel, generating high temperature and high voltage gas, and driving the gas turbine to do power. The equipment capacity of the application has reached hundreds of MW. Such as the installation capacity of 290MW, Germany's Fenolph Power Station was put into use in 1980.