A second generation Solar Power Satellite is nearing completion in earth orbit. Only the big transmitter array was launched from Earth. The main truss segments and photovoltaic panels were manufactured in orbit, using asteroid mining materials. Technological developments and decreasing launch costs have revigorated research into this method of energy production. Organisations such as JAXA (Japan) and EADS Astrium (Europe) are currently considering 'proof of concept missions'. I would love to see this tech developed!
Sketchup 3D / Photoshop - 2013