A modular assembly for the production and accumulation of solar energy comprises a tank for accumulation of fused salts, a reflecting body for capturing the solar rays, a tubular collector facing the parabolic body and impinged upon, in use, by the solar rays sent by the reflecting body, a delivery circuit and a return circuit, which communicate, on one side, with the tank and, on the other, with the collector for supplying the fused salts through the collector; the accumulation tank being set in a position underlying the collector, and the delivery and return circuits being set so as to enable unloading by gravity of the fused salts into the accumulation tank.