serious evaluation of alternative siting patterns as decidely different as those presented in the NASA and ADL studies.* 4.2.2 Deployment Once a rectennae siting pattern has been established, its implementation will generate impacts during both the construction and operation phases of each project. This section focuses on those post-siting issues. 4.2.2.1 Rectenna Construction Before construction actually begins on a rectenna, but after a particular site has been selected, some preliminary impacts can be expected from land speculation and limited population growth. These initial impacts reflect the anticipation of accelerated development and they will influence the availability and cost of land and labor which are primary factors affecting the subsequent attraction of industry. Any study of impacts from industrial and population relocation should examine these initial effects. However, to a certain extent, any such examinations must result in forecasts that are conjectural. In the absence of any actual experience with SPS, the investigator must rely on scenarios about the future demand for and availability of electricity and the future levels of economic activity attracted to areas around the rectenna sites or regions in which they are to be located. The impacts of population growth and economic development that would be directly related to construction of a 5-GW rectenna are somewhat easier to estimate. As discussed in Sec. 3, once the size of the primary work force and the time required to construct an energy facility are known, secondary growth can be estimated using employment multipliers. By estimating the household size for primary, secondary and other workers; multiplying workers by household size; and summing the estimates of total population for each year, a profile of demographic change can be developed for the entire construction period. This export-base approach, which is identical to the principles used in SEAM, is best suited to the study of SPS rectenna construction for several *Other Societal Assessment white papers by Blackburn (Rice University), Donalek and Wysong (Harza Engineering), and Kotkin (Economic Consultants) consider different rectenna siting patterns. However, since these papers were being prepared at the same time this paper was in preparation, it has been impossible to consider their implications here.
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