Dyson Sphere??:
http://io9.com/5902205/how-to-build-a-dyson-sphere-in-five-relatively-easy-steps
Dyson Spheres, Swarms, and Bubbles
The Dyson sphere, also referred to as a Dyson shell, is the brainchild of the physicist and astronomer Freeman Dyson. In 1959 he put out a two page paper titled, "Search for Artificial Stellar Sources of Infrared Radiation" in which he described a way for an advanced civilization to utilize all of the energy radiated by their sun. This hypothetical megastructure, as envisaged by Dyson, would be the size of a planetary orbit and consist of a shell of solar collectors (or habitats) around the star. With this model, all (or at least a significant amount) of the energy would hit a receiving surface where it can be used. He speculated that such structures would be the logical consequence of the long-term survival and escalating energy needs of a technological civilization.
Forbes also had an article on it called, "destroying-mercury-to-build-a-dyson-sphere-is-a-bad-idea".