On Fri, 13 May 2016 09:14:08 +0100, Brian Gaff wrote:

Somehow I feel this would be rather inefficient from the energy point
of view as presumably feeding the prisoners would take more energy than
could be generated.

But aren't you going to feed them anyway?

UK Prison population approx 85,000, a resonably fit person pedling at
a rate they can sustain ought to be able to produce about 100 W. So
8.5 MW
but with eating and sleeping and an 8 hour shift pattern only 1/3 of
that, at very best, would be avialable. Then there would be "un-fit"
for what ever reason perhaps you might get 25%? or about 2 MW?

--
Cheers
Dave.