[en] The energy conservation in Japan has developed through three steps of the strengthening of management, the improvement of facilities and the conversion of processes in industrial fields, by uniting managers, engineers and workers. The energy conservation technology in this case is the composite technology of management technology and thermal and electric technologies, and the multiple aspect tackling is required. The energy consumption in people's livelihood field still increases steadily, but hereafter, attention should be paid to system engineering such as cogeneration, heat pumps and so on, and the system of utilizing unused energy in districts is expected. The occurrence of two oil crises gave severe impact to Japanese economy, and the government and people exerted efforts for the development and introduction of energy conservation technology, as the result, spectacular achievement was attained. Recently the international interest in global environment has heightened, for example on the global warming due to the increase of CO2 emission, and the expectation for energy conservation as the real and sure countermeasure is large. The development of energy conservation and its recent topics are reported. (K.I.)
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