Container for a system for storing and restoring heat, comprising a double wall formed from concrete

A heat storage and restitution system, comprising:

• a vessel comprising means for injecting and withdrawing a gas to be cooled or heated, the vessel including a first jacket formed from concrete surrounded by a thermally insulating layer, the insulating layer being surrounded by a steel shell, and the vessel comprising at least two modules, wherein each module comprises a first volume limited by a first side wall formed from concrete and a perforated base, a second volume surrounding the first volume which is limited by the first side wall, a second side wall formed from concrete, and by the perforated base;
• the first and second volumes being configured for containing a fixed bed of particles of a material for storage and restitution of heat;
• each of the modules being disposed one above the other in a centered configuration so that the second side walls of each of the modules forms the first jacket and the first side wall of each of the modules forms a second jacket formed from concrete;
• and wherein
• the first and second jackets are formed from concrete and the insulating layer is not pressure-tight.