For rooftop building-integrated photovoltaic (BIPV) technology, photovoltaic (PV) modules are typically mounted on the sunny side of a rooftop to receive a high amount of solar irradiance, whereas the opposite side of the rooftop will have free space. This study proposed a novel strategy for building integrated PV and radiative cooling (RC) system, namely BIPV-RC system, by covering the sunny side of a rooftop with PV modules and its free side with all-day RC modules to integrate solar energy collection and RC utilization into a single building unit. A mathematical model was developed for the proposed BIPV-RC system and a case study was conducted in two tropical cities (Karachi, Pakistan and Riyadh, Saudi Arabia). Results show the total electricity and cooling output of the BIPV-RC system in Riyadh is 462.1 kWh.m(-2) and 1315.3 MJ.m(-2), respectively, approximately 20.7% and 94.0% higher than those in Karachi. Moreover, a comparative study between the BIPV-RC system and the common BIPV and building-integrated RC (BIRC) system was performed and results indicate that the annual total energy output of the BIPV-RC system is nearly 79.1% and 16.8% higher than that of BIPV and BIRC system, respectively. (C) 2019 Elsevier Ltd. All rights reserved.