Among other industrialized countries, Japan represents a unique case for examination of the linkages of energy-environment-security. Since 1980 it has broadened the concept of its nati6 security to include non-military issues, which stresses energy security at the point. The I97C crisis altered the country's approach to energy security so that dependence on imports would] adversely affect its economic growth. Since the mid 1980s, however, when global environmental issues turned into an international political agenda, Japan's quest for energy security seems to, met another challenge. This paper assumes that Japan's institutional framework rely on pragmatic roles of economies, politics and technology rather than ideology, providing a foundation for flexibility in producing policies that address the intricate problems of environmental security.