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Space-Based Solar Power A Priority - European Space Agency
Space-based solar power is under serious consideration by the European Union, according to Josef Aschbacher, director general of the ESA space agency, an intergovernmental organization of 22 member states.
(Harvesting sunlight from Earth orbit and then beaming it down to the surface)
"It will be up to Europe, ESA and its Member States to push the envelope of technology to solve one of the most pressing problems for people on Earth of this generation," said Aschbacher...
In concept, space-based solar power is fairly straightforward. Satellites orbiting well above Earth's atmosphere collect solar energy and convert it into current; this energy is then beamed back to Earth via microwaves, where they are captured by photovoltaic cells or antennas and converted into electricity for residential or industrial use. The primary benefits of gathering solar power from space, rather than on the ground, is that there is no night or clouds to interfere with collection; and the solar incidence is much higher than at the northern latitudes of the European continent.
[However] facilitating space-based solar power would require a constellation of dozens of huge, sunlight-gathering satellites located 36,000 km from Earth. Each of these satellites would have a mass 10 times larger, or more, than that of the International Space Station, which is 450 metric tons and required more than a decade to assemble in low Earth orbit. Launching the components of these satellites would ultimately require hundreds or, more likely, thousands of launches by heavy lift rockets.
Science fiction writers have long pondered this idea. As far as I know, the earliest description of the basic idea is the power planet from Power Planet, by Murray Leinster and published by Amazing Stories in 1931:
The Power Planet, of course, is that vast man-made disk of metal set spinning about the sun to supply the Earth with power. Everybody learns in his grammar-school textbooks of its construction just beyond the Moon and of its maneuvering to its present orbit by a vast expenditure of rocket fuel.
('Power Planet' by Murray Leinster)
Only forty million miles from the sun's surface, its sunward side is raised nearly to red heat by the blazing radiation. And the shadow side, naturally, is down to the utter cold of space. There is a temperature drop of nearly seven hundred degrees between the two sides, and Williamson cells turn that heat-difference into electric current, with an efficiency of 99 percent. Then the big Dugald tubes - they are twenty feet long on the Power Planet - transform it into the beam which is focused on the Earth and delivers something over a billion horsepower to the various receivers that have been erected...
(Read more about Murray Leinster's solar power satellite)
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