I’ve been wondering for a while now whether there were any projects on the drawing board for Solar Power Satellites, (SPS) and today I came across a Japanese experiment set to launch on January 18, called the Furoshiki experiment. Furoshiki is a Japanese word for a cloth used to wrap up small possession. The experiment will test whether large structures can be constructed in space by having 3 satellites holding the corners of a Furoshiki 20m on each side, and having small robots crawl along and align themselves in order to transmit a signal. ESA News Release can be found here: "http://www.esa.int/esaCP/SEMHVXVLWFE_index_0.html" [Broken] Along with some videos here: "http://www.esa.int/gsp/ACT/power/solar_power_satellites_furoshiki.htm" [Broken] And a pdf here: "http://www.esa.int/gsp/ACT/doc/Furoshiki%20IAF04%20Paper%20KayaMankinsSummerer.pdf" [Broken] Would anybody know how much solar power could be generated from a SPS? What size would be needed to have any impact at all on our energy needs?