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.