l/VD. D being the electrical density demand). For this reason, use of centralized electrical systems, and thus of SSPS, is no more advisable for a D value under about 200 MWh/km2-year (see Fig. 5). Figure 6 shows that in year 2025 only 10% of world electricity will be consumed in zones with D smaller than 200 MWh/km2-year. However, as shown in Fig. 7, between 20% and 40% of world population (these values being for WEC and WCRU scenarios respectively) will live in these zones. This part of world population is represented in ONU by a large number of states, the opposition of which (or at least the lack of interest) could prevent the implementation of a worldwide international SSPS organisation. Limitation Due to Large SSPS Power Output For the sake of reliability of an electrical distribution grid, it is highly desirable that the more powerful plant in this grid does not provide more than a given fraction (20% at the most) of the total power produced. This is for instance a limitation to the use of nuclear reactors (the output of which are about 1 GW) in small country. But the problem will be much worse for SSPS, the power output of which cannot be downgraded very much under 5GW, with an annual production of about 40 TWh. Figure 7 shows that in year 2025 less than 20% of world electricity will be used in geographical zones where total demand will be insufficient to enable the implementation of a single SSPS rectenna. However, as can be seen in Fig. 8, the number of zones, where the use of SSPS would be prevented, will be about 70%. The analysis of these constraints shows that SSPS, in the present reference design, could satisfy most of the demand of industrialized countries, but is hampered,
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