By contrast to terrestrial solar energy, the use of solar-generated
electricity delivered to Earth by microwaves from orbiting satellites,
as first suggested in 1968 (4), could in principle overcome these
difficulties. As proposed, the satellites would transmit microwave power
to large-scale receiving antennas on low-value land or over the sea
(probably in combination with terrestrial photovoltaic generation),
which would deliver power directly into consumer electricity grids.
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