A concentrated solar tower assembly includes a hollow tower structure defining lower and upper portions. The lower portion includes a closable opening region for configuring a closable opening, and the upper portion includes a top gird having inner and outer top grids. The assembly further includes a solar receiver steam generator entirely installed at the ground level G on the inner top grid simultaneous to erection of the tower. The generator on the inner top grid is slidingly directed within the tower from the closable opening to be entirely accommodated therewithin. Thereafter, the generator on the inner top grid is lifted for being placed along the upper portion of the tower.