2) Evaluation of SPS Economy Studies will evaluate SPS economy such as energy balance and power generation cost. 3) Survey of SPS Influence on Environmental and Ecological Systems Studies will assess the influences of microwave power transmission on environmental and ecological systems such as the ionosphere, humans and communications. To conduct these surveys in detail, working groups have been established for evaluating power generation technologies, system economy, environmental influences and ancillary infrastructures. 2. SPS ’91 and International Cooperation The symposium “SPS ’91' with SPS as the main theme was held near Paris, France, in August this year, under the sponsorship of the Society of Electricity and Electronics (SEE) and the Society of Science and Technology (ISF) of France. This was the second such symposium and was held five years after the first SPS '86. The gathering included Dr. Glaser, the proposer of SPS, and numerous active participants in this field. The symposium’s scale was definitely much larger than the preceding event, with more than 200 researchers and government representatives from 20 countries. Previously, the principal partici- . pants were working in space development, but this time the seminar was characterized by many researchers in other fields such as energy, nuclear fuFig. 1 Middle and long term plan for new energy technology development
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