Power/Energy: Solar Power Satellites: Microwaves deliver the power: Kilometer-diameter antennas would be used in this super system to transmit power to ground-based rectifying antennas

The largest, most powerful microwave transmission system ever considered by man has been proposed to deliver the sun's power from space to earth from a network of Solar Power Satellites. The SPS network, with a 5 × 10-km photovoltaic array on each satellite, would convert the sun's energy to electricity prior to transmission.