TEC and Vasari refineries work by sending out ships to adjacent planets and increasing production at the extractors there. The TEC use a special refinery ship, the Vasari just use a trade ship with a different name. A refinery costs Image:Credits icon.png 1500, Image:Metal icon.png 125, Image:Crystal icon.png 175 to construct for both factions. Each refinery servicing one of your extractors at uncolonizable planets earns it an extra 0.08 metal or crystal per second. There can be a maximum of 4 refineries servicing one extractor.