before we can reap the benefits of power beamed from space to the Earth, we must first effectively beam power from Earth to space. The complexity of a program on this scale is such that for its implementation, simultaneous progress is needed over a whole range of fields. The environmental and biological safety of power beaming must be scientifically proven and gain public acceptance. New international structures need to be realized to enable real cooperation and collaboration, large-scale funding, and the eventual transition from the public to the private sector. While none of these obstacles are insurmountable, the big challenge for space solar power is effectively to address all these fields, be they technical or non-technical, in order to become competitive with other energy sources. Figure 4 Demonstration Scenario
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