Despite the high thermal efficiency attained by evacuated tube receivers (ETR) in solar power tower (SPT) systems, optical losses due to spillage of concentrated power at the receiver are much in existent. The current work aims to minimize the concentrated solar power spillage losses at the central receiver by integrating non-imaging secondary concentrators with the evacuated tubes. A compound parabolic concentrator (CPC) with a W-shaped cavity at the bottom is designed based on an acceptance half-angle of 45° and coupled with an evacuated tube receiver, with 40 and 70 mm tube and glass diameters, respectively. The optical performance of the proposed scheme is analyzed using Monte-Carlo ray-tracing method. The compound parabolic concentrator is integrated with the ETR to intercept the maximum amount of solar radiation from the heliostat field and delivers it to the absorber. The distinguishing feature of this CPC is its orientation, i.e., vertically oriented, receiving solar radiation from primary concentrators (heliostats). Simulation results of the receiver with CPC have shown a recovery of 29 of the spillage losses; this improves the optical efficiency of the receiver to 75. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.