System of orbiting solar-power satellites will appear

Freeman Dyson : physicist, mathematician
In 2160, scientists will begin constructing a Dyson sphere. Such a "sphere" would be a system of orbiting solar-power satellites meant to completely encompass a star and capture most or all of its energy output. Dyson speculated that such structures would be the logical consequence of the long-term survival and escalating energy needs of a technological civilization, and proposed that searching for evidence of the existence of such structures might lead to the detection of advanced intelligent extraterrestrial life.

paper "Search for Artificial Stellar Sources of Infra-Red Radiation"