During the past decade the amount of electricity used by data centers has steadily increased, and
data centers now consume almost 3% of worldwide electricity. Despite continuing efforts to
increase computing efficiency, power consumption by data centers is continuing to consume ever greater quantities of energy.
Keith Lofstrom is an electrical engineer who believes that he may have found a long term solution to the data center problem. Lofstrom wants to put huge number of miniature, solar powered servers (called thinsats) in orbit. This concept, known as "server sky", would be facilitated by a low-cost launch system referred to as "Launch Loop". This loop could put many thousands of tons into space at a small fraction of the cost of using rockets. In an interview with Sander Olson for Next Big Future, Lofstrom describes how the server-sky concept could greatly reduce the need for ground-based data centers, and how Launch Loop might be the best solution to opening up space.
Keith Lofstrom
Question: A number of methods for putting payloads into space without rockets have been proposed. How does the Launch Loop concept compare with other schemes, such as the space elevator, the airship to orbit initiative, or James Powell's Startram concept?
Getting into orbit requires a bit of altitude and lots of velocity. Both require energy. 100 kilometers altitude requires 270 kilowatt hours per ton, about $33 of 12 cent electricity at 100% efficiency. A 10 kilometer per second lunar transfer orbit requires 15 megawatt hours per ton about $1800 of electricity. An inefficient system (like a rocket, a laser powered space elevator, or a hypersonic airship) require far more energy. A launch loop can be about 40% efficient, because energy is transferred in a 14 kilometer per second iron rotor powered by high efficiency linear motors, and delivered to vehicles as magnetic drag. The energy conversion process is very cheap, compared to the switching electronics of a startram mass driver, an airship solar cell and ion engine, or a space elevator climber.