It's a new form of power that could become a valuable source of renewable energy. Thames Water is investing £250m in a plant that will process human waste.
There's no shortage of supply and, if it works, the plant in Oxford will generate enough electricty to supply 37,000 homes. Kate Bunkall takes up the story.
More top news
Thursday afternoon's weather for the West of the region
Thursday afternoon's weather for the East of the region
A crack inside the glass pod of the i360 in Brighton has been fixed. The owners say there was no risk to safety and blame vandalism.