I visited Nsinda prison in Rwamagana district in eastern Rwanda a few weeks ago. I wanted to see how they use biogas to power the prison kitchen. The prison utilises the prisoner's waste to produce the gas to cook the food that the prisoner's eat that makes the waste that produces the gas that… very yin-yang. I filed a report for Reuters. I also produced a slideshow for the BBC, which was published today. If you're interested in how a poo powered prison works, take a look.