Imperial Prison currency.

[MrNexx]

On the topic of energy cells...

What if they're rationed? So, you get X number of energy cells per week. You can do work and get a small amount of extra cells.

But, well, not everyone is going to use all of their cells. And some people will take cells that belong to others ("What are they gonna do, throw me in prison?"). Since they're useful, expire, and there's a legitimate influx, you can get an economy. Maybe a Sullustan doesn't use all of his because he runs the lights less. The Jawa doesn't need nearly as much water, so he trades some of his water to the Sullustan for power. Then the herglic beats up the Jawa and takes the power cells.

Boom. Economy.
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"I've Seen Your Daily Routine. You Are Not Busy!"
“We're going to win this war, not by fighting what we hate, but saving what we love.”
http://rpgcrank.blogspot.com/

[Pel]

Deadpool 2 taught us it's a "prison wallet".
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Aha!