Poo power? Even human sewage can be used to create electricity or fuel. Plans are already underway to power public buses in Oslo, Norway with human sewage. Electricity can also be generated from sewage using microbial fuel cells, which utilize a bio-electrochemical system that drives a current by mimicking bacterial interactions found in nature. Of course, sewage can also be put to use as a fertilizer. The poo-sibilities are endless!