GRAVIMETRIC ENERGY STORAGE SYSTEM AND METHOD

A system for gravitational energy storage is proposed beneath a clay or mudstone layer (2) suitable as a hydraulic barrier in subsurface beneath a land surface, comprising a gap volume under the barrier with an upper and a lower watertight plastic membrane as well as an edge around the gap consisting of a hydraulically consolidated solid from a membrane-forming suspension, a subsurface region acting gravitationally on the gap volume above the gap between the barrier and the land surface, and a technical access (1) from a land surface above the barrier through the subsurface to the underside of the barrier (2) into the gap volume, wherein a tensile-resistant lining (3) is provided starting from the land surface at least in the uppermost section of the access. Furthermore, a method for the production and operation of such a system is proposed.