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Abstract

The invention provides an energy storage system (1) for storing energy in a waterbody (2), such as a sea, an ocean, a waterway, etc. The energy storage system comprises a reservoir structure (8A, 8B, 8C, 9A, 9B, 9C) for a working liquid (7) and an energy storing and retrieving subsystem (10A, 10B). The working liquid (7) in the reservoir structure is completely separated from the water (6) of the waterbody. The reservoir structure comprises a deformable pressurizing subreservoir (8A), which is extending in the waterbody, and which has a liquid-impermeable deformable wall structure (18). The reservoir structure further comprises a buried depressurizing subreservoir (9A), which is an artificial structure, which has been buried under a vertical column of a waterbody underground (5). The energy storage system provides, inter alia, improved energy storage capacity and improved reliability, as well as reduced operational costs and reduced environmental disturbance.

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First Claim