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estimated to be much lower than that of a “concrete solar chimney power plant” and thus becomes remarkably competitive with both comparable technologies, namely wind and PV but also with conventional power generation. 8.13 Concept for Solar Power Satellites At the end of 1970, the United States (Department of Energy and NASA) in co-operation with the European Space Agency (ESA, ESTEC) developed a concept for Solar Power Satellites. The idea was to employ much more solar energy in the space compared to the available solar radiation at the earth’s surface. A space transportation system carries materials and personnel to the construction base in the orbit. The assembled power satellite beams rf-radiation to the rectenna which converts and delivers it to the grid. The solar driven Power Satellite is almost constantly illuminated throughout the year and the microwave beam transferring the energy to the ground is virtually unaffected by atmospheric conditions. Bearing in mind the loss in the microwave transmission system, which is estimated to be less than 40%, each square metre of solar cells in the Solar Power Satellite will deliver approximately five times more energy to the electricity user than would be absorbed from terrestrial photovoltaic power plant. The 3-year assessment programme was finished 1981 with the result, that some proposed types of Solar Power Satellites would be technically feasible – although the technical challenges are formidable - but the environmental, economic, social and international problems and uncertainties are to large for realisation. Energy Satellites Energy Satellites 36PDF Image | Economic Perspectives of Renewable Energy Systems
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