Overseas, particularly East European situation was investigated to effectively promote the development and introduction of oil-alternative energy for Japan. As an energy source in East Europe, coal and brown coal are mainly used, while recyclable energy is seldom utilized. After Chernobyl accident, ex-Yugoslavia and Poland are passive toward the nuclear power generation, while Bulgaria is positively making an investment in it. Poland mainly uses coal which is abundant in SO2 and NOx. Though conversion to oil is being groped for, interest is not heightened in energy recycling. In Hungary, oil and coal production tends to decrease. They make progress in diversification in order to be released from their dependency on the CIS. As new energy to be developed, Rumania studies the wind force, solar heat, geothermal and biomass. Bulgarian policy mainly consists in exploiting coal mines and developing the nuclear energy for the self-sustenance. Czecho and Slovakia are groping for the nuclear energy and diversification. Because of an decrease in oil importation from the CIS, all countries in East Europe must diversify the sources of energy supply. 9 refs., 12 figs., 80 tabs.