Solar arrays are geostationary photoelectric power plants run by the cross-sector Military providing most of planetary power. They are one of the first thing setup when a planet is chosen for colonization. A focused power beam can be very destructive.
Power beams can be used defensively, as those of Hera. They were once uses as a weapon of mass destruction on Artemis 2658 by fourth Emperor Ceron Augustus, killing 47,000 of his own people. Ths catastrophe prompted Beta Sector to end the Second Roman Empire and return control of the solar arrays to the Military
To transport parts to an from the arrays, the Military uses specialised solar array ships.