A device that works to convert other fuel sources into Ethium:
They appear as a cylinder tower of cylinders and pipes and a glass/crystal dome on top. They have a control panel and a typically have roots reaching deep into the ground for materials.
Refineries usually search the ground beneath them for the right elements, being powered by Solar Energy or their own Ethium. They can also convert materials like Uranium into Ethium by a long process that involves the 'Tenth Array'.