Abstract: A system for storing and producing electrical energy deployed in a volume of water delimited by a bottom, comprising a floating structure at the surface of the volume of water, at least one linear and continuous solid mass connected to the platform and movable between a high position and a low position, at least one device for driving one or more linear and continuous solid mass(es) between the high and low positions thereof; the linear and continuous solid mass comprises: an upper end positioned at the surface of the volume of water an opposite end which is free or connected to the bottom of the volume of water a portion lying on the bottom, also called a trailing portion, which is maximum when the linear and continuous solid mass is in the low position; a suspended portion, which is maximum from the moment that a trailing portion exists.

Abstract: A system (200) for storing and releasing energy is provided. The system (200) is deployed in a body of water, and includes a platform (220). The system also includes at least one weight stored on a floor of the body of water, and a hoist system capable of moving the at least one weight between a first elevation position and a second elevation position. A remotely operated attachment device of the system is coupled to the hoist system, and is configured to locate and couple to the at least one weight on the floor of the body of water. The hoist system selectively raises and lowers the at least one weight when coupled to the remotely operated attachment device, from the first elevation position to the second elevation position. The system stores and releases energy when the weight moves between the first elevation position and the second elevation position.