long distance transmission of energy, and the manufacture of synthetic hydrocarbon fuels and fertilizers. By using more, lower power microwave tubes in a large aperture antenna, each SPS can beam power to one or more receiving antennae at different locations. Different frequencies can be used, thus increasing the utilization of both transmitting and receiving antennae. The microwave technology is much the same as that used by the telephone companies for communications here on Earth. Figure 7 is a diagram of the concept. Previous Work In 1977, a feasibility study was undertaken to evaluate an SPS design for a power output of 5 GW for use on Earth. This feasibility study identified key technological, environmental and economic issues for further study and provided the foundation for more extensive system definition studies. An assessment of the SPS concept was the objective of the SPS Concept Development and Evaluation Program (CDEP). "To develop an initial understanding of the technical feasibility, economic practicality, and societal and environmental acceptability of the SPS concept." [13] FIGURE 7 Solar Power Satellite [12] The Space Power System (SPS) Concept Development and Evaluation Program evolved a solar power satellite (SPS) reference system with 5 GW delivered to the terrestrial transmission network. It provided detailed information on the technical and economic feasibility and societal acceptability of WPT. In 1971 Gerard O'Neill proposed using the resources of "Greater Earth", i.e. lunar resources to build solar power
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