Assistance has been provided to lndonesia by the International Atomic Energy Avenev, (JAEA) under a technical co-operation project titled "Comprehensive Assesment at Diferent Energy Sources for Electricity Generation in Indonesia" (NS/O/016). The project's main objective is to support the national planning and decision-making process in Indonesia's energy and electricity sectors, taking into account key economic, social and environmental factors. This study is intended to comprehensively assess the potential contributions of various energy options to the optimal long-term development of Indonesia's energy supply and demand consistent with sustainable development.