Thanks for this article Toby heheh! Very impressive stuff!
"The technology uses microbes which feed on urine for their own growth and maintenance. The MFC is in effect a system which taps a portion of that biochemical energy used for microbial growth, and converts that directly into electricity - what we are calling urine-tricity or pee power. This technology is about as green as it gets, as we do not need to utilise fossil fuels and we are effectively using a waste product that will be in plentiful supply." (2015 Smithers, The Guardian)