The 100 kW high concentration photovoltaic (HCPV) system has been constructed in October 2007 at the Institute of Nuclear Energy Research (INER), Taiwan. The maximum module efficiency with a geometrical concentration ratio of 476x is about 26.1% under 850 W/m(2) DNI and passive cooling conditions [Cherng-Tsong Kuo. The project of demonstrating MW high concentration photovoltaic (HCPV) system. Science and technology yearbook of Taiwan. ROC; 2008]. The 100 kW HCPV system consists of 14 sets of pillarstand 5 kW systems and 21 sets of roof-top 1.5 kW systems. Each 5 kW system and 1.5 kW are comprised of 40 modules and 12 modules respectively. Each module was integrated with 40 solar cells with 35% conversion efficiency each, manufactured by Spectrolab Company, the highest III-V solar cell conversion efficiency record keeper. This project is the pioneer for the establishment of one MW HCPV demonstration system in 2008. (C) 2008 Published by Elsevier Ltd.