Energy Vault to build grid-level, gravity-fed battery from a tower of concrete blocks

In this case, that potential energy is stored inside huge concrete blocks. To charge up this skyscraper-sized “battery,” a six-armed crane lifts the blocks off the ground and stacks them up around its base, creating a tower. To discharge, the crane simply lower the blocks back to the ground, converting the kinetic energy from the descent into electricity. Proprietary algorithms calibrate and control the charge and discharge cycles to make it as efficient as possible.

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