Patent ID: 11920550
Assignee: HANS GUDE GUDESEN
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  E  Y | IPC F

Claim 6:
7. A method for producing and storing energy by operating an underground hydroelectric energy production and storage system the method comprising:
creating an underground cavity by solution mining in salt deposits;
providing an upper water reservoir with an upper water reservoir surface;
providing tubing structure to lead water from the upper water reservoir into the underground cavity via an inlet tube and out of the underground cavity via an outlet tube, wherein the tubing structure comprises a closed hydraulic loop including a communicating system configured to preserve hydraulic head provided by the upper water reservoir;
providing a pumping device to contribute to pumping water from the upper water reservoir via the tubing structure out of the cavity;
providing an energy generator to generate energy based on water flowing through the tubing structure, and
arranging the closed hydraulic loop to allow for density differential pumping, wherein the density differential pumping is dissolved gas driven, wherein the pumping device includes a gas provision device arranged to saturate water in the inlet tube with a gas and a gas nucleation structure arranged in the outlet tube to assist in nucleating gas bubbles out of the water, and the energy generator includes a turbine arranged at a bottom part of the closed hydraulic loop.