3.0 DEFINITION OF SPS REQUIREMENTS The concept of a system of space-based solar power satellites does not yield or derive its being from a conventional requirement or set of requirements. In general, the SPS is proposed as a supplemental source of electrical energy for terrestrial applications. The need is evident, but broad acceptance of SPS to satisfy the need involves the resolution of many complex issues such as economic competitiveness and environmental concerns. The total commitment to SPS is dependent upon a long term ''learn as you go" process leading to a potential application during the last decade of this century.
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