Scientists have figured out how to turn abandoned mines into gravitational batteries.

Such a system will allow you to accumulate excess energy for later use. According to the project, electric motors will raise and lower sand containers, generating electricity through regenerative braking on the way down and then using some of it on the way back. For maximum efficiency, elevators can take the load on the surface and drop it at the bottom of the shaft. In this case, they will be able to remove excess sand from below when there is an excess of energy in the network. According to scientists, one such station can store from 7 to 70 terawatt-hours of electricity.