A method 900 for assembling a concentrated solar tower assembly 1000 for a solar power plant, the method comprising: constructing a foundation base 310 at a ground level; erecting a hollow tower structure 100 extending vertically from the foundation base, the hollow tower structure 100 defining a lower portion 102 and an upper portion 104; characterized in that installing a sliding arrangement 400 of a predetermined distance extending from the foundation base 310, and erecting an inner top grid 112 capable of sliding on the sliding arrangement 400, the inner top grid 112 is capable of being lifted to the upper portion 104 of the hollow tower structure 100 from the ground level to be coupled to the upper portion 104, whereby the upper portion 104 having a top grid 110 obtained by coupling the lifted inner top grid 112 to an outer top grid 114, and the lower portion 102 having a closable opening region 106 for configuring a closable opening 106a; erecting a solar receiver steam generator 200, at the ground level, on the inner top grid 112, slidable on the sliding arrangement 400, at a predetermined distance from the hollow tower structure 100, simultaneous to the hollow tower structure 100 erection; placing a lifting system 600 on the outer top grid 114, the lifting system 600 having at least one tension cable 610 extending downwardly from the outer top grid 114; sliding the solar receiver steam generator 200 along with the inner top grid 112 on the sliding arrangement 400 from the predetermined distance to within the hollow tower structure 100 from the closable opening 106a of the lower portion 102 and subsequently closing the closable opening 106a; hoisting the solar receiver steam generator 200 along with the inner top grid 112, for travelling from the lower portion 102 to up to the upper portion 104 within the hollow tower structure 100, by the lifting system 600; and coupling the inner top grid 112 having the solar receiver steam generator 200 with the outer top grid 114 for placing the solar receiver steam generator 200 on the top gird 110 along the upper portion 104. constructing a foundation base 310 at a ground level; erecting a hollow tower structure 100 extending vertically from the foundation base, the hollow tower structure 100 defining a lower portion 102 and an upper portion 104; characterized in that installing a sliding arrangement 400 of a predetermined distance extending from the foundation base 310, and erecting an inner top grid 112 capable of sliding on the sliding arrangement 400, the inner top grid 112 is capable of being lifted to the upper portion 104 of the hollow tower structure 100 from the ground level to be coupled to the upper portion 104, whereby the upper portion 104 having a top grid 110 obtained by coupling the lifted inner top grid 112 to an outer top grid 114, and the lower portion 102 having a closable opening region 106 for configuring a closable opening 106a; erecting a solar receiver steam generator 200, at the ground level, on the inner top grid 112, slidable on the sliding arrangement 400, at a predetermined distance from the hollow tower structure 100, simultaneous to the hollow tower structure 100 erection; placing a lifting system 600 on the outer top grid 114, the lifting system 600 having at least one tension cable 610 extending downwardly from the outer top grid 114; sliding the solar receiver steam generator 200 along with the inner top grid 112 on the sliding arrangement 400 from the predetermined distance to within the hollow tower structure 100 from the closable opening 106a of the lower portion 102 and subsequently closing the closable opening 106a; hoisting the solar receiver steam generator 200 along with the inner top grid 112, for travelling from the lower portion 102 to up to the upper portion 104 within the hollow tower structure 100, by the lifting system 600; and coupling the inner top grid 112 having the solar receiver steam generator 200 with the outer top grid 114 for placing the solar receiver steam generator 200 on the top gird 110 along the upper portion 104.