Thin gallium-arsenide solar cells promise high efficiencies and power to weight ratios, important for satellites of all sizes. Further, such cells can be rolled or folded to achieve high stowed power densities, which is especially important for small satellites, as well as for larger satellites with high power requirements, for example to support electric propulsion. The reduced costs offered by the manufacturing process used for these cells may also be attractive for spacecraft planning to utilize larger electric propulsion systems. Sunnyvale, CA-based Alta Devices holds world records for solar cell efficiency and presents here details of its current lightweight GaAs solar technology as well as highlights of its technology roadmap as applicable to LEO satellites.