Formed by the merger of General Electric and Bernal Space Power Systems in 243. Exa was during the period 250-500 one of the major energy suppliers to cislunar space, employing orbital solar collectors, fusion, beamed power and antimatter for various energy needs. Although less dependent on outer system He3 as other Orbital Alliance corporations, it generally supported the hardliners against the outer system (possibly because increased tensions would increase its own profit margin). It was one of the earliest employers of micrograv tweaks, although maintenance work on their solar energy and antimatter farms was generally regarded as the lowest form of grunt work. The corporation prospered until the nanodisaster which, despite sensible precautions, managed to infiltrate and digest more and more of the orbital systems for raw material.