Solar Panel

Solar Panel is a technology that can harness the energy of the sun. Solar energy is one of the only two known of energy beside Sakuradite in the world of Code Geass. Whereas Sakuradite is shown that it can power automotive like Cars to a military equipment like Knightmare Frame. Solar Energy can power the entire city. They appear as early as the first episode powering the Britannian occupied city of Tokyo. In Code Geass: Akito the Exiled. The European Union along with Britannia also have solar panels powering their city. Whether the other power have this technology it's not known.