Brazil Prison Bicycles

Apparently there is a prison in Brazil that allows inmates to bicycle and produce electricity, which in turn is tracked and reduces their sentences.

Presumably this program is only offered to inmates who commit minor crimes (like theft, etc) as opposed to the more violent criminals.

I would be curious to learn how much electricity is actually produced this way.

It might be, for example, more financially viable to have the inmates build windmills instead and those windmills be used for producing electricity. Longer term results as opposed to short term gain.

Not dissing bicycles or anything, just saying windmills seems like the smarter solution if their end goal is electricity.