PRS Environmental Issues The SPS CDEP assessments of the environmental impacts of power beaming are applicable to the PRS [2], Examples include land use for the transmitting and receiving antennas, the aesthetic effects of such use. potential deleterious effects on human health, safety considerations, destruction of valued resources, and the intangible effects that may influence the quality of life. Economic Considerations Because the PRS will not be fully developed for 15 years it is difficult to project the cost of commercial PRSs and their global market. However, costs are equally difficult to provide for other advanced energy technologies. Cost estimates, uncertain as they may be, are indicators of the competitive cost of a PRS system compared with other long distance transmission, e.g., high-voltage transmission lines. Table 5 shows rough order of magnitude cost estimates for a 2 and 4 GW PRS. These estimates were prepared based on past economic studies such as the SPC CDEP, and current estimates of key system elements. The cost estimates indicate that they are in a range to justify more detailed economic assessments of the PRS design approaches as applicable technologies evolve. Increasing the microwave flux density from 23 mW/cm^ to 50 mW/cm’ and using a more uniform rather than a Gaussian distribution across the microwave beam
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