Abstract
As global energy demand increases, improving energy security is one of the main issues of energy related problems in Japan. Thus the purpose of this paper is to evaluate energy security quantitatively and imply the best energy resource mix for the Japanese sustainable energy system from the perspective of energy security with considering an economic perspective. This study is mainly divided into three parts; conceptualizing energy security, evaluating energy security through international comparisons, and obtaining pareto optimal solutions by solving a multi-objective analysis considering energy security and economic feasibility. GAMS is used for coding the multi-objective analysis called an augmented ε-constraint method (AUGMECON). The results show that the Japanese energy system has improved from 2000 to 2010 from the aspect of both energy security and supply cost, however, it is still inferior to those of other countries. In order to improve energy security, the increase of the use of renewable energy and natural gas instead of oil and coal is recommended, therefore, it is an urgent task to establish a stable supply system using renewable energy and expand high resilient gas pipelines.
