for that application, by the population density of these countries. Reversely, in most of the developing countries, land is available but the low demand of electricity makes the large power system not suitable. CONCLUSION Our studies have been mainly based on geographical data, as distribution of people on Earth, or on technical data, as grid management constraints. They show on one side the huge market resulting from the need of energy for development of many countries, on the other side the technical limitations for SSPS to catch this market. We do not neglect economical and political constraints, that will also play a major role, but we think other symposium attendants will be more competent to discuss these matters. To conclude on the technical side, we will state that satellite solar power stations is a very promising concept but, for different reasons, its use in large parts of the world may be severely hampered by its large power output and its large land requirements. Such a situation may jeopardize the international acceptance of the project, which is particularly necessary due to its impact of Earth environment. So the study of alternative concepts allowing smaller size receiver on the ground and smaller minimum power of receivers seems advisable, to reach an acceptable concept of worldwide SSPS system. Acknowledgements — Wc are grateful to Doctor J-J. Payan, head of CNRS, for his confident support. Thanks also to Marie-Therese Coutant for her valuable assistance. REFERENCES 1. Department of Energy, Satellite Power System, Concept Development and Evaluation Program, Report DOE/ER 0023. Department of Energy, Washington. DC. 1978. 2. M. Claverie and A. Dupas. Preliminary Evaluation of Ground and Space Solar Electricity Market in 2025. Presented at the XXIX Congress of the International Astronautical Federation. Dubrovnik, 1978. 3. A. Dupas and M. Claverie. The Potential Global Market in 2025 for a Satellite Solar Power Station, Presented at the AIAA Conference on Space Industrialisation, Princeton, NJ. 1979. 4. M. Claverie and A. Dupas, Prediction of Global Solar Electricity Market up to Year 2025, Presented at the International Solar Energy Congress, Atlanta, GA, 1979. 5. M. Claverie and A. Dupas, Forecast of the World's Electrical Demands Until 2025. Impact Sci. Soc. 29, No. 4. 1979. 6. Edison Electric Institute. Economic Growth in the Future, McGraw-Hill. New York. 7. Report to the Conservation Commission of the World Energy Conference, World Energy Demand to 2020. IPC Science and Technology Press. 8. Department of Energy, Satellite Power System. Mapping of Exclusion Areas for Rectenna Sites, Report HCP/R 4024-10, Department of Energy, Washington, DC, 1978. 9. J. Ruth and W. Westphal. Study on European Aspects of Solar Power Satellites, Contract No. 3705/78/F/DK/1SC), European Space Agency, France. 10. M. Claverie and A. Dupas, Assessment of Global Solar Electricity Market up to Year 2025, Presented at the Second UNESCO International Forum on Fundamental World Energy Problems. Saint- Jacques de Compostelle, 1979. 11. M. Claverie and A. Dupas, Possible Limitations to SSPS Use Due to the Distribution of World Population and World Energy Consumption Centers. Presented at the XXXI Congress of the International Astronautical Federation, Tokyo, 1980. 12. M. Claverie and A. Dupas, Market Potential and Problems for SSPS, Presented at the 21e Convegno Internazionale Scientifico Sullo Spazio. Rome. 1981. 13. M. Claverie and A. Dupas, Solar Satellite Power System and the Equinoxial Eclipses Problems, Presented at the XXXII Congress of the International Astronautical Federation. Rome. 1981.
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