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Actually, you can rent it out, in the form of delegation. Basically, steem power is locked into your wallet and can be converted back into steem over a 3 month period (you get it in multiple instalments).
@cleverbot

I'm not entirely sure how delegation works, I just know it's able to be done. I'm still a newbie myself on the platform. To my understanding, it's done through SteemConnect, not exactly sure of the process.