Fuel Gel is used to power most modern starships in the cosmos. It is extremely rare, and worlds that produce it tend to be quite prosperous. The exception to this is planet Bryyo, a Federation protectorate--and the largest supplier of Fuel Gel. Proceeds from Bryyonian gel sales go directly to the Federation military forces protecting that sector of space.
The sheer value of Fuel Gel is very attractive, and has led to an uprise in piracy over the last 20 years. Today, raids on gel transport convoys are common, especially in frontier regions of space. The Galactic Federation has increased antipiracy operations, and planets with Fuel Gel resources are protected by Federation fleets and ground forces.